51动漫

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?

Right-handedness, horse-riding habits and swords are all reasons why bike chains are found on the right side of bikes, say our readers

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

Tom Gauld on a parallel universe where time flows backwards

Twisteddoodles: How parenting has changed

thermal night vision grab of starlings roosting A group of common starlings come in to roost after dark ? shown using thermal imaging cameras, Bodmin Moor, Cornwall Page 235, Wild Isles book

Comment

Stunning photographs accompany Attenborough’s Wild Isles show

FGGJAF M44 - Praesepe also known as the Beehive Cluster - an open star cluster in the constellation of Cancer

Space

How to spot the Beehive cluster in the constellation of Cancer

What do you call gunk with mathematical qualities? Hypergunk

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?

Many of our readers disagree that raw rhubarb tastes horrible, and come up with many reasons why this plant became a food crop

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

This week鈥檚 new questions

Tom Gauld: A cockroach speaks out

Twisteddoodles: Schrodinger in the age of the internet