杏吧原创

Mathematics

Try these mathematical magic tricks that are guaranteed to work

There are no rabbits pulled out of hats here 鈥� these tricks rely on mathematical principles and will never fail you, says Peter Rowlett

Golden lion tamarin; Shutterstock ID 121264012; purchase_order: -; job: -; client: -; other: -

Why aren鈥檛 humans covered in hair like other primates are?

2EXM9NK Hand Knuckle Finger Joint Crack. Fingers Snap

How can popped knuckles be so exceptionally loud? Part 2

PEWCN3 Relaxed senior couple on picnic sitting on park bench talking and having coffee. Old man and woman relaxing at park having coffee.

Why do older people seem to find that time passes more quickly? Part 2

close up the fly on the window, on the glass, the concept of sanitation, dangerous insects, insect repellent, copy space; Shutterstock ID 1168097506; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

Humans

People watch sports, have sex, make children, study finds

Tom Gauld on what happens when you turn it up to 11

Twisteddoodles: Adventures in meeting new people

Rafflesia panchoana on Mt Kemalugong

Life

Saving the world’s largest flowers in the Philippines

2BERRPE Spring sky panorama with Milky Way and constellations at Dinosaur Provincial Park, Canada.

Space

How to spot the Spring Triangle as the equinox approaches

Now is a great time to look for a pattern of stars known as the Spring Triangle, wherever you are in the world, say Abigail Beall

Why do the climbing plants in my garden all twine anticlockwise?

What is the best way to minimise crumbs when slicing bread?

This week鈥檚 new questions

Will you be enjoying your robot dessert wriggling or stationary?