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2RXK2EN Catford Local Area Photography

What is the largest size an animal can be?

Our readers explain the maximum size of a quadrupedal animal and consider the sizes of dinosaurs, blue whales and colonial organisms

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

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

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

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

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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

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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?

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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

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This week鈥檚 new questions

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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?

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Builder or carpenter working on the roof - silhouette with strong back light; Shutterstock ID 84416038; purchase_order: -; job: -; client: -; other: -

What happens when a hammer hits a nail?

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Food tin cans. Groceries background with dof.; Shutterstock ID 169474457; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

In a post-apocalyptic but non-nuclear world, how long would canned food remain edible? And compared with a completely still universal reference point, how fast am I moving and in which direction?

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

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

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This week鈥檚 new questions

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

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