51动漫

Aerial View of Mount Everest 8,848 m (29,029 ft), Himalaya, Nepal, Asia.

This week鈥檚 new questions

What governs the maximum height of mountains on Earth? Could a mountain as high as Olympus Mons on Mars (21.9 kilometres, more than double the height of Everest) be possible on Earth? And do we actually know how the ancient Romans pronounced Latin words?

MXMH8X colorful water drop splash

I fill a tub with water by gravity, but what happens to the gravity?

People say 鈥榣aughter is the best medicine鈥�, but does it actually help?

Aerial view of car driving on beautiful steep curved road (look like number 3) on the high mountain in Nan province, Thailand.; Shutterstock ID 1815816242; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

A low angle action shot of a road cyclist approaching a smooth tarmac hill on a group ride around Seva, Catalonia, Spain.

Why are the gears and chain always on the right鈥慼and side of bicycles?

little hungry birds Tits on the bird feeder eating fat; Shutterstock ID 588202970; purchase_order: -; job: -; client: -; other: -

Do birds have faster reaction times than humans?

Would a tug of war be possible between France and England? (part 2)

2FERAXY Crowded groups of people crossing the street at Times Square during rush hour

This week鈥檚 new questions

Farmer harvesting organic rhubarb from her kitchen garden. Rhubarb can be harvested many times through the year. Photographed at an ???off grid??? home on the island of Moen in Denmark. Colour, horizontal format with some copy space.

How was rhubarb found to be edible when it isn鈥檛 palatable raw?

EHE3AK Spinning Globe. Image shot 07/2010. Exact date unknown.

How would weather change if Earth rotated in the opposite direction?

Our planet and its history would be very different if our planet spun the other way, say our readers

This week鈥檚 new questions

Is it better for a roll of toilet paper to roll towards you or away?

Is it possible to yawn without closing your eyes? If not, why?

How could I reach other dimensions in the multiverse? (part 2)