51动漫

Beautiful sky and blue ocean; Shutterstock ID 122089855; purchase_order: -; job: -; client: -; other: -

Would whisking cold water up from the ocean depths help with warming?

This isn鈥檛 a sensible plan, say our readers - not only would it require huge amounts of energy, but it would have a disastrous effect on marine life

B095JB Swarm of gnats (Nematocera), Bavaria, Germany, Europe

Are gnats attracted to eyeballs, or do we just notice these ones most?

champagne spoon

This week鈥檚 new questions

Split view of a pod of sperm whales in a social group showing the sky and below the waterline, north western Mauritius.; Shutterstock ID 742662229; purchase_order: -; job: -; client: -; other: -

Why don鈥檛 marine mammals like whales get 鈥榯he bends鈥�?

The Supermoon rises over houses in Olvera, in the southern Spanish province of Cadiz, July 12, 2014. Occurring when a full moon or new moon coincides with the closest approach the moon makes to the Earth, the Supermoon results in a larger-than-usual appearance of the lunar disk. REUTERS/Jon Nazca (SPAIN - Tags: SOCIETY CITYSCAPE TPX IMAGES OF THE DAY) - GM1EA7D0FC401

When was it realised that moonlight is reflected sunlight? Part 2

How do dogs recognise that another animal is also a dog? Part 3

2K6A82T Artist's concept of astronauts and human habitats on Mars.

This week鈥檚 new questions

Why do fallen trees grow stems vertically from a horizontal trunk?

B1PP5G Spiral Galaxy M74 i. Image shot 2008. Exact date unknown.

What makes galaxies spin in a certain direction?

Various disco, soul and funk, seven inch records at second hand store.

Why can鈥檛 we conjure up smell and touch in our heads? Part 3

One reader recalls the time he experienced the unmistakable smell and taste in his mouth of egg, chips and beans

This week鈥檚 new questions

Is the speed of light in high gravity different from in low gravity?

Why is the east coast of Madagascar so straight?

This week鈥檚 new questions