December 05, 2019
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    Advisory for Heavy Rain

    December 05, 2019

    The Department of Meteorology today issued Advisory for Heavy Rain says that “Prevailing showery condition in Northern, Eastern, North-central, Uva and Central provinces is expected to continue. Cloudy skies can be expected over the island.Heavy showers above 100 mm are likely at some places in Jaffna, Kilinochchi, Mullaitivu,Mannar, Vavuniya, Anuradhapura, Polonnaruwa, Trincomalee, Batticaloa, Ampara,Nuwara-Eliya, Badulla and Monaragala districts.Fairly heavy showers about 75-100 mm are likely at some places in Sabaragamuwa,Southern and Western provinces (Galle, Matara, Hambanthota, Kegalle, Ratnapura,Gampaha, Kaluthara and Colombo districts) and in Matale and Kandy districts. Fairly strong gusty winds up to 50 kmph can be expected over the island, particularly in Northern, North-Central, North-Western, Central and Uva provinces and in Trincomalee district.General public is kindly requested to take adequate precautions to minimize damagescaused by temporary localized strong winds and lightning during thundershowers.
    DAMAGE EXPECTED:
     Heavy rain falls are expected in Central hilly areas.
     Heavy rains may trigger landslides in hilly areas.
     Water inundation in low lying areas
     Uprooting of large avenue trees.
    ACTION SUGGESTED:
     People living in hilly areas (particularly landslide prone areas) are requested to bevigilant.
     Drivers and people using roads in the hilly areas are requested to be vigilant.
     Take adequate precautions to minimize damages caused by lightning activity.
     Beware of fallen trees and power lines.
     Be alert on the advisories issued by the Department of Meteorology.
     For emergency assistance contact the local disaster management authorities.

    Prevailing showery condition in Northern, Eastern, North-central, Uva and Central provinces is expected to continue.Showers or thundershowers will occur at times in Northern, North-central, Eastern, Uva and Central provinces and in Hambantota district. Showers or thundershowers will occur elsewhereafter 1.00 p.m. Showers may occur in North-western province during the morning too.Heavy showers above 100 mm are likely at some places in Jaffna, Kilinochchi, Mullaitivu, Mannar, Vavuniya, Anuradhapura, Polonnaruwa, Trincomalee, Batticaloa, Ampara, Nuwara-Eliya, Badulla and Monaragala districts.Fairly heavy showers about 75-100 mm are likely at some places in Sabaragamuwa, Southern and Western provinces (Galle, Matara, Hambanthota, Kegalle, Ratnapura, Gampaha, Kaluthara and Colombo districts) and in Matale and Kandy districts.Fairly strong gusty winds up to 50 kmph can be expected over the island, particularly in Northern, North-Central, North-Western, Central and Uva provinces and in Trincomalee district.General public is kindly requested to take adequate precautions to minimize damages caused by temporary localized strong winds and lightning during thundershowers.

    Most of us tend to think of time as linear, absolute and constantly “running out” – but is that really true? And how can we change our perceptions to feel better about its passing?
    Claudia Hammond

    “Time” is the most frequently used noun in the English language. We all know what it feels like as time passes. Our present becomes the past as soon as it’s happened; today soon turns into yesterday. If you live in a temperate climate, each year you see the seasons come and go. And as we reach adulthood and beyond, we become increasingly aware of the years flashing by.

    Although neuroscientists have been unable to locate a single clock in brain that is responsible for detecting time passing, humans are surprisingly good at it. If someone tells us they’re arriving in five minutes, we have a rough idea of when to start to look out for them. We have a sense of the weeks and months passing by. As a result, most of us would say that how time functions is fairly obvious: it passes, at a consistent and measurable rate, in a specific direction – from past to future.

    Of course, the human perspective of time may not be exclusively biological, but rather shaped by our culture and era. The Amondawa tribe in the Amazon, for example, has no word for “time” – which some say means they don’t have a notion of time as a framework in which events occur. (There are debates over whether this is purely a linguistic argument, or whether they really do perceive time differently.) Meanwhile, it’s hard to know with scientific precision how people conceived of time in the past, as experiments in time perception have only been conducted for the last 150 years.

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    What we do know is that Aristotle viewed the present as something continually changing and that by the year 160, the Roman emperor-philosopher Marcus Aurelius was describing time as a river of passing events. And in the West, at least, many would still identify with these ideas.

    But physics tells a different story. However much time feels like something that flows in one direction, some scientists beg to differ.

     

    If memories were fixed like videotapes then imagining a new situation would be tricky (Credit: Javier Hirschfeld/Getty Images/Alamy)

    In the last century, Albert Einstein’s discoveries exploded our concepts of time. He showed us that time is created by things; it wasn’t there waiting for those things to act within it. He demonstrated that time is relative, moving more slowly if an object is moving fast. Events don’t happen in a set order. There isn’t a single universal “now”, in the sense that Newtonian physics would have it.

    It is true that many events in the Universe can be put into sequential order – but time is not always segmented neatly into the past, the present and the future. Some physical equations work in either direction.

    One aspect of time perception many of us share is how we think of our own past: as a kind of giant video library, an archive we can dip into to retrieve records of events in our lives
    A few theoretical physicists, such as the best-selling writer and physicist Carlo Rovelli take it even further, speculating that time neither flows, nor even exists. It is an illusion.

    Of course, although some physicists propose that time does not exist, time perception – our sense of time – does. This is why the evidence from physics is at odds with how life feels. Our shared idea of what the concept of “future” or “past” mean may not apply to everything everywhere in the Universe, but it does reflect the reality of our lives here on Earth.

    Like the Newtonian idea of absolute time, however, our belief in how time works for humans can also be misleading. And there may be a better approach.

    False pasts

    One aspect of time perception many of us share is how we think of our own past: as a kind of giant video library, an archive we can dip into to retrieve records of events in our lives.

    But psychologists have demonstrated that autobiographical memory is not like that at all. Most of us forget far more than we remember, sometimes forgetting events happened at all, despite others’ insistence that we were there. On occasion even the reminder does nothing to jog our memories.

    As we lay down memories, we alter them to make sense of what’s happened. Every time we recall a memory, we reconstruct the events in our mind and even change them to fit in with any new information that might have come to light. And it’s much easier than you might think to convince people that they have had experiences which never happened. The psychologist Elisabeth Loftus has done decades of research on this, persuading people they remember kissing a giant green frog or that they once met Bugs Bunny in Disneyland (as he’s a Warner Bros character, so this can’t have happened). Even recounting an anecdote to our friends can mean our memory of that story goes back into the library slightly altered.

     

    People can be peruaded to "remember" events that never happened to them (Credit: Javier Hirschfeld/ Getty Images)

    Another mistake we make is to assume that imagining the future is completely different from thinking about the past. In fact, the two processes are linked. We recruit similar parts of the brain to reminisce or to picture our lives in years to come. It is the possession of our memories that permits us to imagine a future, remixing scenes to preview future events in a window in the mind. This skill allows us to make plans and to try out different hypothetical possibilities before we commit.

     

    These curious sensations occur as a result of the way our brains deal with time. A baby, with little by way of autobiographical memory, lives constantly in the present. She’s happy. She’s crying. She’s hungry. She’s miserable. A baby experiences all this, but doesn’t think back to how cold it was last month or worry that temperature might drop again soon.

    Then gradually a toddler will begin to develop a sense of self. With that development comes an understanding of time, of yesterday as distinct from tomorrow.

    Time is not only at the heart of the way we organise life, but the way we experience it
    Even at that age, though, imagining one’s self in the future remains a challenge. The psychologist Janie Busby Grant found that if you ask three-year-olds what they might do the following day, only a third can give an answer judged to be plausible. When the psychologist Cristina Atance gave small children some pretzels to eat followed by the option of more pretzels or some water, it won’t surprise you to learn that, thirsty after eating the salt, most chose water. But when she asked them what they would like to have when they came back the next day, most still opted for water. (Adults chose pretzels, knowing that by tomorrow they will feel hungry again.) Very small children are unable to imagine themselves in a future where they might feel differently than they do in this moment.

    The experience of time is actively created by our minds. Various factors are crucial to this construction of the perception of time – memory, concentration, emotion and the sense we have that time is somehow located in space. Our time perception roots us in our mental reality. Time is not only at the heart of the way we organise life, but the way we experience it.

    Of course, you could argue that it doesn’t really matter whether we perceive time accurately according to the laws of physics. On a daily basis, we can carry on walking without needing to remember that, however flat the world feels while you’re on the ground, it is spherical. We still talk of the Sun rising in the morning and setting in the evening, even though we know that it is the Earth and not that the Sun that is moving. Our perceptions don’t keep up with the science – and we can only create our everyday experience of the world using the senses we possess.

     

    If someone asked you to imagine floating to work on a lilo, most of us would have no problem imagining it (Credit: Javier Hirschfeld / Getty Images)

    Likewise, our perception of time is not something we can choose to ignore. However much you learn about four-dimensional space-time, waiting for that delayed train is still going to feel longer than having lunch with your friend.

    But even if we can’t change our perceptions of time, we can change the way we think about it – and perhaps feel better about its passing, and ourselves, as a result.

    Time for change

     

    Instead of considering the past, present and future to be in a straight line, we can look on our memories as a resource to allow us to think of the future.

    This is crucial. Humans’ ability to time travel mentally, forward and back, is why we’re able to do so many of the things that set us apart – such as plan for the future or create a work of art. And the important role that memory has to play within that isn’t a new idea: Aristotle, for example, described memories not as archives of our lives, but as tools for imagining the future.

    We shouldn’t curse our memories when they let us down
    This means that what may have seemed like a flaw before – our difficulty to recollect the past accurately – is actually an advantage. If memories were fixed like videotapes then imagining a new situation would be tricky. If I asked you to picture yourself arriving at your workplace next Tuesday morning not via your usual route, but instead floating on a lilo on a turquoise canal lined with tropical flowers, past familiar buildings right up to the front door of your office where your old school friends will greet you with a cocktail, in an instant most of you will be able to do it. (An exception is people with an unusual condition called severely deficient autobiographical memory.)

    Your memory is so flexible that in an instant you can summon up your personally-recorded memories of the street where you work, what it’s like to lie on a lilo, the faces of your school friends, images of tropical flowers and cocktails. You not only locate all these memories which might be decades apart, but you then splice them together to invent a scene you have never witnessed or even heard of before.

     

    We still talk of the Sun rising in the morning and setting in the evening, even though we know it is the Earth moving (Credit: Javier Hirschfeld/Getty Images)

    Cognitively, it sounds like hard work. In fact, the flexibility of our memories makes it fairly easy to do.

    So we shouldn’t curse our memories when they let us down. They’re made to be changeable, in order that we can take millions of fragments of memories from different times of our lives and recombine them to give us endless imaginative possibilities for the future.

    In fact, when our memory for the past is damaged, so is our ability to think about the future. The neuroscientist Eleanor Maguire asked people to describe an imaginary future scenario in which they were standing in a museum. Some said it had a domed ceiling. Others a marble floor. But people with amnesia were unable to suggest what it might look like due to our reliance on memory to allow us to think about the future.

    Instead of thinking of our memories as a handy video archive, we can bear in mind that our memory of an event might not be perfect – and accept that others might have very different memories of the same event.

    Slowing down

     

    There’s one other thing we can do. The single question I have been most often asked after writing a book on time perception is, how can we slow time down?

    But I wonder whether we should be careful what we wish for. In middle age, the weeks and the years can feel as though they flash by. But part of our sense of time passing is dictated by the number of new memories we have made. When you look back on a busy holiday, even though it went quickly at the time, in retrospect it can feel as though you were away for ages. This is because of all those new memories you made by spending a week outside your usual routine. If life feels as though it’s going fast, this could be a sign of a life that is full.

    If you do want to shed that unsettling feeling on a Sunday evening that the weekend has whizzed by, there is something you can do: constantly seek out new experiences
    Meanwhile, time does feel as though it’s going more slowly if you are bored or depressed or feeling lonely or feeling rejected, none of which we would want to seek out. As Pliny the Younger wrote in 105, “The happier the time, the shorter it seems.”

    But if you do want to shed that unsettling feeling on a Sunday evening that the weekend has whizzed by, there is something you can do: constantly seek out new experiences. Take up new activities at weekends and visit new places, rather than heading for the same pub or cinema. All this fun means the time will fly in the moment – but because you will lay down more memories, when you get to Monday morning, the weekend will have felt long.

     

    As Pliny the Younger wrote in AD 105, “the happier the time, the shorter it seems” (Credit: Javier Hirschfeld/ Getty Images)

    Some routine, of course, is unavoidable. But if you can create a life which feels both novel and entertaining in the present, the weeks and years will feel long in retrospect. Even varying your route to work can make a difference. The more memories you can create for yourself in everyday life, the longer your life will feel when you look back.

    The way we experience time in our minds is never going to match up with the latest discoveries in physics. We all know what the passing of time feels like. Although we can’t change the way our brains perceive time, there are better ways we can start to think about it. But even then, the way it warps in certain situations will continue to surprise and unsettle us. In the end, perhaps, St Augustine put it best when he asked: “What then is time? If no one asks me, then I know. If I wish to explain it to someone who asks, I know it not.”

    The tricks that can turn you into a speed reader
    BRAIN

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    Speed reading can seem like an almost superhuman feat – but is it really possible to read quickly and retain the information?
    Claudia Hammond
    By Claudia Hammond
    2nd December 2019
    M

    Many of us would love to be able to read faster, yet still take everything in. There are methods dating back decades that people have tried in the hope of being able to digest a lengthy book in well under an hour.

    The most obvious method, which we all do from time to time, is to skim read, glancing through the text and flicking through the pages to try to find the key points. Or there’s meta-guiding where you use your finger to point to specific words, to keep your eyes on track without getting distracted. Or methods where you learn to read several lines at a time. And now digital technologies have been developed, with apps that take text and then flash the words up one on the screen one at a time in rapid succession.

    There is no doubt that clever methods like these can help you get through the text faster. The question is how much understanding you trade in for that speed. When it comes to hard evidence, it can be difficult to assess commercial courses and apps claiming to improve your speed-reading abilities because experiments under controlled conditions conducted by independent observers are rare.

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    For some answers, we can turn to the work of the late psychologist Keith Rayner who was at the University of California, San Diego. He spent many years assessing the mechanisms behind some of these methods and pioneered reading-speed research by tracking eye movements. In 2016, he published a paper reviewing what the latest science can tell us about attempts to speed read.

     

    Some speed readers can finish a long book in a matter of hours, while ostensibly also comprehending the information in it too (Credit: Getty Images)

    When we are reading, most word detection takes place in the central part of the retina called the fovea where there’s a high concentration of cells called cones. These cells detect the pattern of light and dark areas on the page, and pass that information on to the brain where the pattern is recognised as words. Some speed-reading methods aim to teach people to use more of their peripheral vision to read, allowing people to take in more than one word at a time. But in the periphery of the retina you find fewer cones and more of a cell type called rods, which aren’t as good at picking out light and dark areas on the page.

    Words can be presented to us so rapidly that the brain doesn’t have time to process them
    How about presenting individual words to the eyes at speed? Rayner found that this can work very well for sentences, but it’s not only the eyes that limit our reading speeds – cognitive factors bring their own limitations. He concluded there’s a risk that once this method is scaled up to cover whole pages of text, words can be presented to us so rapidly that the brain doesn’t have time to process them. The result is our eyes pass over the words but we don’t understand them.

    So is there a way to speed up how quickly we can comprehend a word? When we read our inner voice sometimes vocalises the words in our head, and some suspect that this might slow us down. Could banishing that voice make a difference? Not necessarily. Internal vocalising might be helping us to understand what’s happening, according to research by eye-tracking psychologist Mallorie Leinenger.

     

    The difficulty is how to increase your reading speed without compromising on the ability to take in and understand the text (Credit: Getty Images)

    If it’s so hard to find a reliable method for speeding up our eyes and our minds, it raises the question of how speed-reading champions can devour entire books in minutes rather than hours and yet still seem to understand them. Is it possible that they are exceptionally good at effective skimming?

    In some situations skimming can work for the rest of us too. Sometimes all you want is to find one particular fact in a report, in which case skim reading is fine. And sometimes you just need to get the gist of things, in which case strategies such as reading headings, looking for keywords, reading the first paragraph of each section and then the first sentence of subsequent paragraphs is one way through it. Of course, it all depends on the type of material you are reading. It’s more likely to work with a textbook than with an experimental novel.

    But the good news is that there is a way of learning to read faster, and that is to practise. Again, we are not just limited by our vision. What matters is how fast you can identify a word – a process that is faster when the word is more familiar. So the more you read, the faster you can get.

    The researchers analysed 52 different species of migratory birds As the climate warms, birds are shrinking and their wingspans are growing, according to a new study.Researchers analysed 70,716 specimens from 52 North American migratory bird species collected over 40 years.The birds had died after colliding with buildings in Chicago, Illinois.The authors say the study is the largest of its kind and that the findings are important to understanding how animals will adapt to climate change."We found almost all of the species were getting smaller," said lead author Brian Weeks, an assistant professor at the school for environment and sustainability at the University of Michigan."The species were pretty diverse, but responding in a similar way," he said. "The consistency was shocking."He said studies of animal responses to climate change often focus on shifts in geographical range or timing of life events, like migration and birth. But this study suggests body morphology is a crucial third aspect.
    All measurements were taken by one researcher, Dave Willard, over the 40-year period"That's one major implication," he said. "It's hard to understand how species will adapt without taking all three of these things into consideration."The findings showed that from 1978 to 2016, the length of the birds' lower leg bone - a common measure of body size - shortened by 2.4%. Over the same time, the wings lengthened by 1.3%.The evidence suggests warming temperatures caused the decrease in body size, which in turn caused the increase in wing length."Migration is an incredibly taxing thing they do," Mr Weeks said, explaining that the smaller body size means less energy available for the birds to complete their long journeys.He says the birds most likely to survive migration were the ones with longer wingspans that compensated for their smaller bodies.The scientists aren't exactly sure why warmer temperatures cause birds to shrink. One theory is that smaller animals are better at cooling off, losing body heat more quickly due to their larger surface-area-to-volume ratios.Mr Weeks said the body of specimens was the result of a "herculean effort" by Dave Willard, co-author of the study and an ornithologist at the Field Museum in Chicago.
    Dave Willard stands with the Field Museum's vast collection of bird specimens in 1999
    In 1978, he started walking around buildings in the mornings during spring and fall migration to collect birds that had collided with buildings.Birds usually migrate at night and are attracted to the artificial light from buildings, causing fatal collisions with windows. Hundreds of millions of birds are estimated to be killed in building collisions each year."He didn't have this study in mind," Mr Weeks said. "He just thought it could be useful in the future."Over the years, many volunteers and scientists contributed to the collection efforts.Mr Willard measured all 70,716 specimens himself using the same methods, "the gold standard" for this type of data, according to Mr Weeks.The paper was published in the journal Ecology Letters.
    It builds on a growing body of evidence that suggests animals are shrinking as the climate warms.In 2014, researchers found that alpine goats appeared to be shrinking due to warming temperatures. The same year, another study found salamanders had shrunk rapidly in response to climate change.

    Plastic pollution has killed half a million hermit crabs, study says
    Researchers said they found 526 hermit crabs had been trapped inside one container An estimated 570,000 hermit crabs have been killed after being trapped in plastic debris, a new study has said.The researchers said piles of plastic on beaches create physical barriers and "deadly traps" for the crabs.The study looked at strawberry hermit crab populations on two remote tropical island locations.The scientists say more research is needed into how plastic pollution is affecting wildlife populations worldwide, especially on land."The potential for plastics on beaches and in other terrestrial ecosystems to cause harm is under-acknowledged," said co-author Alex Bond, a senior curator in the department of life sciences at the Natural History Museum in London.He says plastic in the ocean entangles and is ingested by wildlife, but on land it acts as a trap and a barrier to species going about their daily lives.The researchers surveyed sites on the Cocos (Keeling) Islands in the Indian Ocean and Henderson Island in the South Pacific. They say both locations are littered with millions of pieces of plastic.They say crabs had crawled into plastic containers and were unable to get out, eventually dying. The containers had openings that allowed the crabs to enter, but were positioned with the opening facing an upward angle, making it so the crabs would have difficulty crawling back out.
    A bottle on a littered beach with shells from hermit crabs that were trapped inside
    The researchers counted how many hazardous containers there were and how many contained trapped crabs, and extrapolated their findings to estimate totals for the islands."These results are shocking but perhaps not surprising," said lead researcher Jennifer Lavers from the institute for marine and Antarctic studies at the University of Tasmania in Australia."It is inevitable that these creatures will interact with and be affected by plastic pollution," she said.The problem is worsened by the fact that hermit crabs don't have a shell of their own. As they grow, they need to move into larger shells. When one crab dies, it emits a smell that tells another crab a new shell is available.Meaning, "the very mechanism that evolved to ensure hermit crabs could replace their shells, has resulted in a lethal lure," according to the paper.In one container, researchers found 526 hermit crabs. They also found containers with both dead and living crabs, the latter presumably drawn in by the former.The authors say hermit crabs play an important role in the ecosystem. They fertilise and aerate soil, and disperse seeds. They also play a role in tourism - an important source of employment on the islands - by giving visitors a chance to observe native wildlife.Though the study was conducted on remote islands, Mr Bond says plastic pollution is global, and that this is likely to be an issue anywhere hermit crabs live alongside debris.

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