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This week鈥檚 new questions

Why is tea more likely than coffee to leave a stain in the cup? And how exactly does one entangle two photons? Can it be done at home?

Close up of a spinning globe on black; Shutterstock ID 22230961; purchase_order: -; job: -; client: -; other: -

Does life require Earth鈥檚 rate of rotation to lie in a certain range?

Spaceman walks on the red planet Mars. Space Mission. Astronaut travel in space; Shutterstock ID 532139260; purchase_order: -; job: -; client: -; other: -

Should we genetically modify humans we send to Mars? Part 2

In late summer sunflower ripened on the farm field; Shutterstock ID 1883406451; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

2FWP497 Liquid iron molten metal pouring from ladle container into mold, industrial metallurgical factory, foundry cast, heavy industry background.

Could there be an advanced technological society without iron?

Cosmonaut in a futuristic dystopian city . Sci fi and virtual reality concept . This is a 3d render illustration . ; Shutterstock ID 2230705453; purchase_order: -; job: -; client: -; other: -

What happens to our electronic cloud records when we die?

BD5TB8 Alien and Older People, Cowes, Isle of Wight, England, UK, GB.

This week鈥檚 new questions

Medium shot of a young female astronaut sleeping in a glass pod in a space station; Shutterstock ID 1526690303; purchase_order: -; job: -; client: -; other: -

If humans needed to hibernate, how would civilisation have developed?

2T2B4HK One man walking by a close up of a pair of eyes from a portrait painted by Antonello de Messina on a poster in central London

Could two three-dimensional images create a four-dimensional one?

2DAC6P0 Sculpture 'Medics to the World' honouring the health care workers battling Covid-19

There are good and bad bacteria, but are there good viruses? Part 2

Another reader takes on this question, bringing bacteriophages to the party

This week鈥檚 new questions

What is a smooth continuous curve with three axes of symmetry called?

How and why did complex languages like Latin develop? Part 2

This week鈥檚 new questions