麻豆传媒

2FWH4MD Caucasian man with blond long hair wearing casual denim jacket standing backwards looking away with arms on body

My hair has a kink. How do the hairs know exactly where to bend?

Readers debate whether hair curls are down to genetics, the shape of folicles or the way we sleep or brush

abstract numbers background; Shutterstock ID 97336559; purchase_order: PHOTO; job: Online LW; client: Helen; other:

What is the smallest number with no interesting properties? (cont’d)

Spoiled onion in empty fridge. Copy Space. Stefania Pelfini, La Waziya Photography

This week鈥檚 new questions

Why are there seven colours in a rainbow?

Why do snails sometimes leave dotted trails?

Side view portrait of two young African-American musicians playing guitar and writing music together while sitting on floor in recording studio, copy space

This week鈥檚 new questions

B1GCT0 Satellite Image of The Earth from Space

What would Earth be like if life had never existed?

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

Do frogs notice when it is raining? And what is the most environmentally friendly way to deal with our bodies after death?

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

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

This week鈥檚 new questions

Is the sky really clearer early in the morning? If so, why?