91色情片

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

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 is the evolutionary basis for greed?

This week鈥檚 new questions

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?

cofee cup on the sand at the sunset; Shutterstock ID 1450632401; purchase_order: -; job: -; client: -; other:

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

MB9M93 Monster Truck Jumping Mid Air

What are the pros and cons of using carbon dioxide in tyres? part 2

Disappointed woman packing for a journey: she is standing in front of her suitcase overfilled with clothes, travel and vacations concept; Shutterstock ID 2314449417; purchase_order: -; job: -; client: -; other:

How do you get the most clothes into a suitcase? part 2

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

This week鈥檚 new questions

fluffy Persian kitten walking on the piano; Shutterstock ID 162425339; purchase_order: -; job: -; client: -; other:

What do animals hear when music is played to them?

Neon Welcome signboard retro style, Toilet sign with boy, girl figure. Glowing inscription on dark red brick background. Suitable for night outdoor banner, advertisement, shop, night club. 3D render.; Shutterstock ID 2265283835; purchase_order: -; job: -; client: -; other:

Do you wake up needing to pee, or wake up then need to pee? part 2

If you鈥檙e aware of waking first and then decide to pee, broken sleep may be to blame. If the urge itself wakes you up, it鈥檚 the bladder

What part do my ears play when I think of a tune? part 2

This week鈥檚 new questions

What part do my ears or auditory system play when I think of a tune?

What are the pros and cons of using carbon dioxide in tyres?