杏吧原创

Feedback investigates new research that attempts to replace the soles of paratroopers' shoes with something more closely resembling the paw of a cat, while also looking into some startling inventions intended to thwart hijackers

Humans

If the odds are always tipped in favour of the casino, how do professional gamblers make a living? And, since the time of Christopher Columbus, Europe has benefited from crops from the Americas, such as potatoes. But what crops grew in Europe that Native Americans didn鈥檛 have?

Earth