LifeOldest mass animal stranding revealed in Death Valley fossils About 540 million years ago a group of jellyfish washed ashore, died and fossilised – preserving evidence of the earliest example of an animal mass death event News
LifeThe ethics issue: Should we colonise other planets? As ever more potentially habitable exoplanets are discovered, it's time we asked ourselves: do we have the right to take over another world? Features