91色情片

Will the ocean ever be too salty for life to thrive? Part 2

The concentration of salt in the ocean doesn鈥檛 change much, so plant and animal life don鈥檛 have anything to worry about, explain our readers

Planet in water - Moon. Science fiction art. Solar system. Elements of this image furnished by NASA; Shutterstock ID 579784837; purchase_order: -; job: -; client: -; other:

If all Earth鈥檚 water were put in a ball, how large would it be? Part 2

2HR09CM Killer whale, Orcinus orca, spy hop, Vestfjord, Ofotfjord, and Tysfjord, Lofoten Islands, Norway, Atlantic Ocean

This week鈥檚 new questions

Holy prosociality! Batman makes people stand for pregnant passengers

EXERB1 Red field poppies and blue cornflowers.

Environment

Do weeds really love poor soil? Not if you look at the science

2S95MK4 Tourists play a game of Snakes and Ladders at a Chinese temple ahead of the Lunar New Year of the Snake celebrations. Lunar New Year which falls on January 29, 2025, welcomes the year of the Snake, which will be celebrated by the Chinese around the world. (Photo by Wong Fok Loy / SOPA Images/Sipa USA) Credit: Sipa US/Alamy Live News

Mathematics

Bored of snakes and ladders? Some maths can help bring back the fun

ENTETC Robin, (Erithacus rubecula), garden bird standing on top of a branch in winter, UK

Do birds actually sleep more in winter?

Is the concentration of salt in the oceans gradually increasing?

2K18TC6 London, UK. 16th Sep, 2022. Shaikha Al Mazrou, Red Stack, 2022, Lawrie Shabibi - Frieze Sculpture, one of the largest outdoor exhibitions in London, including work by international artists in Regent's Park. Credit: Guy Bell/Alamy Live News

Why do we use pillows? part 2

Close-up of a Cymbiola nobilis shell, also known as the noble volute, against a black background, featuring its distinctive zigzag patterns and smooth texture; Shutterstock ID 2637416271; purchase_order: -; job: -; client: -; other:

This week鈥檚 new questions

How do sea molluscs create the consistent patterns of their shells? What is the advantage to walnuts and pecans of their convoluted kernel shapes?

Think of a card, any card 鈥� but make it science

Environment

Cold War bunker collapses onto beach

Twisteddoodles: So, you’re a rocket scientist?

Tom Gauld: Our journey began with a simple question