Could this tiny creature, named after a mythical multiheaded monster, hold the secret to eternal youth? Related to jellyfish and anemones, the hydra has an almost otherworldly ability to heal itself and stave off aging.
You Don’t Have a Male or Female Brain – the More Brains Scientists Study, the Weaker the Evidence for Sex Differences
A program called Covax wants to distribute Covid-19 vaccines fairly. Is it working?