51动漫

B1GCT0 Satellite Image of The Earth from Space

What would Earth be like if life had never existed?

Without life, our planet would be a hostile and alien place 鈥� and possibly even a nondescript brown colour

a metal water barrel stands in the garden; Shutterstock ID 1980910310; purchase_order: -; job: -; client: -; other: -

How does water become stale?

If sitting cross-legged is unhealthy, why is it so comfortable? Part 2

Common frog (Rana temporaria) sheltering from rain under toadstool (Macrolepiota procera) the Netherlands

This week鈥檚 new questions

The truth about a truth study that was untruthful

Tom Gauld’s highlights of the physicists versus wizards summer games

Twisteddoodles: ‘What should we use to make science more fun?’

an explosion of colored particles on a dark background, composition on the theme of science, molecular physics, space and a festive background

How does a photon know to travel at the speed of light?

KMXN2B Beautiful fun happy smiling African American couple wearing white shirts laying in grass, faces of woman and man next to eachother in opposite

Why do humans show their teeth to signal friendship or mirth?

2D6CTBM Wedding candy bar with different colored bright cupcakes, macaroons, cakes, jelly and fruits.

This week鈥檚 new questions

What makes a cake a cake and a biscuit a biscuit? And is there an upper limit to temperature, akin to absolute zero?

Technology

NASA tests a new heat shield featuring Spiderweave

How to make delicious jam according to science

Humans

Could we grow endangered plants on other planets? No

Tom Gauld: Do you ever feel like we’re being observed?