BIOLOGY

Bringing woolly mammoths back from extinction might not be such a bad idea — ethicists explain

We found more than 54,000 viruses in people’s poo — and 92% were previously unknown to science

Male fertility: how everyday chemicals are destroying sperm counts in humans and animals

Photos from the field: zooming in on Australia’s hidden world of exquisite mites, snails and beetles

Clicks, bonks and dripping taps: listen to the calls of 6 frogs out and about this summer

Are there ‘male’ and ‘female’ brains? Computers can see a distinction, but they rely strongly on differences in head size

Tick, tock… how stress speeds up your chromosomes’ ageing clock

A virus is attacking koalas’ genes. But their DNA is fighting back

‘Gay gene’ search reveals not one but many – and no way to predict sexuality

A deadly fungus threatens to wipe out 100 frog species – here’s how it can be stopped

You need more than just testes to make a penis