51动漫

Mandatory Credit: Photo by FLPA/Shutterstock (9110614a) Grey Wagtail (Motacilla cinerea) adult female, breeding plumage, perched on moss covered branch, calling, Suffolk, England, May Nature

Why do wagtails constantly wag their tails?

Constant tail wagging could help with catching insects, or to deter predators

Young women swim breaststroke, wearing swimming caps and goggles.

This week鈥檚 new questions

Humans

When the scientific publishing industry goes rogue

Humans

Do your own experiment to see if your teabags really are compostable

Tom Gauld on how far a telescope can see

Twisteddoodles: A cat’s observations on birds

Life

Polar bears caught feeding on a whale carcass in breathtaking photos

GPABM3 Mother and child lighting and holding a candle in Orthodox Church

Does belief confer an evolutionary advantage?

TTN6C3 Low angle majestic view of aurora borealis over forest

Does Earth鈥檚 magnetic field affect the weather?

BDPR4X The head of a horse

Do any other animals have an awareness of their mortality? (Part 2)

It鈥檚 human chauvinism to assume not, argues one reader, and another shares his experience of how his dogs respond to death

This week鈥檚 new questions

Humans

How to analyse your garden soil and choose the plants to suit it

Humans

Benjamin Franklin’s quest to make farts less malodorous

Tom Gauld on the adventures of Science Knight