杏吧原创

A 3D illustration of the now debunked competing conspiracy theory that the Earth is flat, as it appears from land, rather than spherical. Earth texture maps courtesy of NASA.gov; Shutterstock ID 1240127368; purchase_order: -; job: -; client: -; other:

What would the horizon look like on a disc-shaped planet? part 3

Two readers argue that we鈥檝e overlooked some key information about disc-shaped planets

High five from a cute scruffy dog with a big smile! Cream wall background, shallow depth of field. Clever dog, the Bailey lightbox

This week鈥檚 new questions

pecan nut; Shutterstock ID 356646077; purchase_order: -; job: -; client: -; other:

What is the advantage to walnuts and pecans of their convoluted form?

Close-up of adorable young seal swimming in clear blue water and looking at camera, near Brighton, Sussex, United Kingdom

Why do seals have such cute faces?

nose

When we breathe, why does the dominant nasal passage swap sides?

EH7TAT Clock faces, illustration

Can a person experience more than 24 hours in a day? Part 3

This week鈥檚 new questions

Why don鈥檛 orcas attack humans? part 3

Can acquired tastes become unacquired?

Why do we scrunch up our eyes when we want to see more clearly?

Scrunching up your eyes can help focus your vision, explain our readers

Is foam a solid, a liquid or a gas?

Can a person experience more than 24 hours in a day? part 2

This week鈥檚 new questions

Can someone experience more than 24 hours in the same calendar day?