Treating COVID-19 one year in: what have we learned?; Me, myself and I: Little words might signal a breakup is coming, long before you know it; What’s feeding the algae growing on — and helping to melt — Greenland’s ice?; Faster, higher, stronger — bats reach Olympian heights and record speeds; Amateur astronomers use the ‘mark one eyeball’ to find brown dwarf stars; If fish don’t experience gravity, can astronauts learn from them to stay in shape?