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BBC Knowledge IndiaBBC Knowledge India

BBC Knowledge India October 2017

BBC Knowledge is a magazine for young inquisitive minds where well-researched, handpicked stories are matched with breath-taking visuals to cover science, history and nature.Written by renowned International and Indian experts, its wide range of features provide rivetting and up-to-date information on topics as varied as technology, archeology, natural history and space exploration. With material meant to stimulate the mind, BBC Knowledge looks to empower a generation of young readers.

Country:
India
Language:
English
Publisher:
Worldwide Media Private Limited
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IN THIS ISSUE

access_time2 min.
from the editor

Yes, this is a scientific magazine, but, sometimes, isn’t science magical too? We’ve got a fascinating set of experiments this issue in our DIY Science feature – go on, try them all! What’s life without a little fun in the most unexpected ways? Do write in and tell us how you got along… Then, there’s a cool story about how hackers are working their way through the world wide web, causing financial mayhem and political problems, or just indulging in some mischief. Also, on the cool front, but in a totally different way, the giant otters of the Peruvian Amazon are taking on the caimans of the river, and winning for the most part, and we have the beautiful flora and fauna of Ecuador in our Portfolio section. We have the many Caesars…

access_time2 min.
letters

Even though I have a very hectic schedule, I would like to take a moment to say a big thank you for giving us such ‘knowledge’. I came to know of BBC Knowledge only recently, when a friend suggested I read it. I started reading the issue with great curiosity, and my excitement built with each page I turned. The name of the magazine “BBC Knowledge” is very apt for what it is giving its readers. I hope to continue gaining knowledge with the coming magazines. Keep up the good work. Thank you! – Rajesh Palanisamy FROM TWITTER. It’s so cool to read some amazing stuff including about the #multiverse theory in this latest edition of @KnowledgeMagIND . #BBCKnowledge – Swarit Sohaard Hello BBC Knowledge! I am a fresh MBA student and was looking around for things…

access_time10 min.
q & a

Dr Alastair Gunn Astronomer, astrophysicist Alex Franklin-Cheung Environment/ climate expert Dr Peter J Bentley Computer scientist, author Prof Mark Lorch Chemist, science writer Dr Helen Scales Oceans expert, science writer Prof Robert Matthews Physicist, science writer Luis Villazon Science/tech writer Prof Alice Gregory Psychologist, sleep expert WHY DO SOME FISH HAVE COLOURLESS BLOOD? Antarctic icefish have colourless blood with no red blood cells and no haemoglobin, the oxygen-carrying pigment. This probably comes down to a genetic mutation, and means their blood carries 90 per cent less oxygen than red blood. They survive partly because frigid Antarctic waters are oxygen-rich. Icefish also have enormous hearts that pump huge volumes of blood around their bodies, making sure they get enough oxygen. Antifreeze in their blood stops them from freezing (the salty Southern Ocean gets down to -2°C) but, as they are…

access_time1 min.
…frogs and fresh milk?

1Frogs, like all amphibians, have thin, porous skin that they can breathe through. But this also poses a risk because it makes it easier for bacteria to infect them. 2To protect themselves, frogs secrete substances called cationic antimicrobial peptides (CAMPs). Other animals secrete CAMPs too, but frogs produce much more, including some peptides that are effective against multi-resistant bacteria. 3Milk goes off because of bacteria, especially species of Lactobacilli and Pseudomonas. These ferment the lactose in milk into lactic acid, and hydrolyse milk proteins into various unpleasant tasting by-products. 4According to Russian folklore, putting a live frog in milk would help it stay fresh. Recent research has found that CAMPs from the Russian brown frog could kill the bacteria in milk and prevent it from turning. PHOTOS: SCIENCE PHOTO LIBRARY, SHUITTERSTOCK…

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what would happen if all earth’s insects vanished?

1. Food chain collapse Most non-marine food chains depend on insects. Almost all birds eat insects, and even those that eat seeds as adults still feed insects to their young. It takes 200,000 insects to raise a swallow chick to adulthood. Insects also break down plant matter and help recycle nutrients into the soil. Without any insects at all, most bird and amphibian species would be extinct in two months. 2. No pollination Of the world’s food crops, 75 per cent are pollinated by insects. Without insects, we could still grow many foods, but onions, cabbage, broccoli, chillies, most varieties of tomato, coffee, cocoa and most fruits would be off the menu. So would sunflower and rapeseed oil. Demand for synthetic fibres would also surge because bees are needed to pollinate both cotton…

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...when i sleep?

Sleep consists of two radically different physiological states. There is rapid eye movement sleep (REM) and non-rapid eye movement sleep (NREM). The sleep stages seem to have different functions, but why we sleep is still not completely understood. Babies spend half of their sleep in REM, but this drops to a quarter by the age of two. It is therefore thought that REM sleep is particularly vital for the developing brain. In NREM sleep, brain activity slows and a person woken at this stage may feel groggy. 1. Pituitary gland During non-REM sleep, the pituitary gland produces growth hormone and secretes prolactin. This counteracts dopamine, to lower general arousal levels. 2. Mouth You produce less saliva, which reduces the need to swallow. Five per cent of adults also grind their teeth at night, mostly…

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