Nature Podcast – This week, we discover what proportion of cancer cells actually form tumours, try to predict the size of future tsunamis, find out what’s in store for farming, and talk to stargazers who have spied a blast from the past.

Indonesia to reject tagging of HIV carriers

A controversial bill to track patients with HIV using implanted microchips is unlikely to pass.

Methane bursts from frozen tundra

Ice build-up may squeeze greenhouse gas from cold soil.

Astronomers revisit a blast from the past

Light ‘echoes’ from 436-year-old supernova explosion first seen by Tycho Brahe.