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J773YF Kitchenware on shelves with stainless steel sink in 17th century Kintyre stone cottage

What happens to the stains in my sink when I clean it with bleach?

One reader wields the power of chemistry to answer this question - but concludes that elbow grease is probably the best approach to cleaning your sink

2H6020J Few pedestrians on the rather busy street in metaverse conceptual reality

This week鈥檚 new questions

2RXK2EN Catford Local Area Photography

What is the largest size an animal can be?

2DBWHRA A Atom with electrons and protons moving in the microcosmos.

Is there the same number of electrons as protons in the universe?

2JF72KW Digital hands reaching each other, artificial intelligence creativity concept

Will we ever be able to tell if an AI gains consciousness? Part 2

hot Jupiter class exoplanet, gas giant planet lit by an alien sun (3d space rendering); Shutterstock ID 1150780133; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

Surrealism with a woman holding a mirror and covering her face in the field with a transparent background behind the mirror; Shutterstock ID 2153195107; purchase_order: -; job: -; client: -; other: -

How do I know if what I see is actually there?

R1D8PY Silverback western lowland gorilla sitting down to eat at Zoo Atlanta in Atlanta, Georgia. (USA)

Could aliens work out if a human or an ape built a tomb? Part 2

This week鈥檚 new questions

FY9W05 International Space Station and astronaut in outer space over the planet Earth. Elements of this image furnished by NASA.

Do cells in an astronaut鈥檚 body multiply at the same rate as on Earth?

It鈥檚 all relative, say our readers - for the astronaut, they do, but compared with someone staying on Earth, they don鈥檛. Just listen to Albert Einstein

What happens when a hammer hits a nail?

This week鈥檚 new questions

If we could step to the universe鈥檚 furthest point, what would we see?

Why do large military planes have wings on the top of the fuselage?