91色情片

Earth core structure. Elements of this image furnished by NASA; Shutterstock ID 371019560; purchase_order: -; job: -; client: -; other: -

Why does our planet have an iron core?

When Earth was forming, heavier materials sank to the centre, say our readers, while lighter ones such as silicon rose to the surface

2JP8KPY Very tight parking in Italy with a small dented family car bumper to bumper squashed in next to two cars in a parking bay with only inches to move.

What is the shortest space a parked car can get out of? Part 3

HFRCEK Knife slicing wholegrain bread

This week鈥檚 new questions

ginger cat slumped over a branch stuck in a cherry tree; Shutterstock ID 1750273625; purchase_order: -; job: -; client: -; other: -

Humans make mistakes, but how often do other animals?

CRF88E Woman spooning meat into tupperware

Why are leftovers always tastier when heated up the next day?

Brachiosaurus dinosaur in water next to islands with palm trees. This is a 3d render illustration; Shutterstock ID 2218581533; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

2CXYTWB Close up of a green cicada insect bug on a plant

What triggers cicadas to make noises in unison, then go silent?

2JAN5P2 Holland Street meets the steep Albion Hill in the Hanover neighbourhood of Brighton

Do people in hilly towns have better health than those in flat towns?

Golden lion tamarin; Shutterstock ID 121264012; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

K4E74X The Earth from space. This image elements furnished by NASA.

If Earth stopped rotating, would this affect the force of gravity?

Gravity itself would be unchanged, say our readers - but stopping the Earth鈥檚 rotation wouldn鈥檛 be a great move for anyone wanting to survive

Why do we say 鈥渁ww鈥� when we see small, fluffy things?

This week鈥檚 new questions

What is the probability that Voyager 1 or 2 will hit a planet or star?

Why does a slightly damp sponge absorb water better than a dry one?