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How come humans can’t use sonar in the dark, like bats?

How come humans can’t use sonar in the dark, like bats? asks Kevin Guan, via email.

Listening for the echoes of their own rapid-fire, high-pitched calls, bats navigate the night, while snatching tiny insects from the air. Dolphins (along with many whales and shrews) are also skilled “echolocaters.” And it turns out that we humans, [...]

How come when you eat sour candy you make weird faces?

How come when you eat sour candy you make weird faces? asks Danielle Vollono, a student in Brookville, NY.

It’s how we decode dinner: Scientists say there are at least four basic tastes — sweet, salty, sour and bitter. (Some add a fifth, umami, the savory taste provided by an amino acid in food called [...]