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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?

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

What is it about human physiology that leads us to use pillows?

Gold jewelry with space for writing; Shutterstock ID 735656746; purchase_order: -; job: -; client: -; other:

Why do jewellery chains in a box become so tightly knotted together?

(Original Caption) 7/5/1946-The roller coaster is a rough ride, but do they love it! This unposed photo was taken by the intrepid photographer from a front seat, as the car made a stomach-dropping descent. A companion clutched the camera while he clicked the shutter. ACME ROTO SERVICE FOR IMMEDIATE RELEASE BPA 2 #124

Why do we scream in fear? part 2

INDIA. Bangalore. 2016. Laughing Yoga workshop participant Rie Sakamoto

This week鈥檚 new questions

PGRFBG beautiful exoplanet, part of an alien binary star system with a red and blue star (3d space illustration)

Can a planet orbit a binary star system in a figure of eight?

(Original Caption) 7/5/1946-The roller coaster is a rough ride, but do they love it! This unposed photo was taken by the intrepid photographer from a front seat, as the car made a stomach-dropping descent. A companion clutched the camera while he clicked the shutter. ACME ROTO SERVICE FOR IMMEDIATE RELEASE BPA 2 #124

Why do we scream in fear?

3BHN5M7 A woman holds a sign that reads Greed is not a virtue during a protest across the street from Florida Congresswoman Maria Elvira Salazar's Office.

What good is greed? part 2

Cute toddler and a baby girl having a play date in the park

This week鈥檚 new questions

This sequence of artist's illustrations shows how a black hole can devour a bypassing star. 1. A normal star passes near a supermassive black hole in the center of a galaxy. 2. The star's outer gasses are pulled into the black hole's gravitational fie

Do black holes look doughnut-shaped when viewed in all directions?

Black holes may appear to be shaped like a doughnut, but the truth is more complicated than that, explain our readers

What is the evolutionary basis for greed?

This week鈥檚 new questions

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

I’m in an arid desert with some caffeinated coffee. Should I drink it?