The human body has developed sophisticated responses to a range of threats, such as heat, cold, hunger, thirst, and danger.
The camel's hump is perhaps its defining feature. It's not just an anatomical oddity but a brilliant bit of evolution.
Insects live in abundance in every part of world except the sea, which covers more than 70 percent of the Earth's surface. So why is it that this tenacious species has failed to colonize the marine environment?
So Stephen Hawking says we'll need to get off-planet within 100 years. He may be right, or not. We may live on Mars or the moon, or not. Either way, space is physically tough on humans. Will we biologically evolve?
Global warming scientists have warned that heat levels in South Asia, home to some 1.5 billion people, could reach uninhabitable levels by 2100. India, Pakistan and Bangladesh would be the worst affected regions.
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