Streams of medicines: how Switzerland cleaned up its act

What 40 years as Observer science editor has taught Robin McKie

RFK Jr’s mixed messages on vaccines

Is ‘de-extinction’ really possible?

Evidence of alien life, a clue about the rise of bowel cancer, and a new colour?

Why did Just Stop Oil just stop?

Why did Spain and Portugal go dark?

How old are we really? What a test can tell us about our biological age

Surviving 200 snake bites, decoding ancient scrolls and the countries ‘flourishing’

Have we got the appendix all wrong?