Health & Fitness
COVID vaccines are on the horizon, but how long might protection last?; Wallabies from Australia have gained a foothold in the UK, and may be there for good; In the ancient Americas, female big-game hunters were common; You're cooler than your ancestors — by about a degree; Chemical engineer Molly Shoichet wins Canada's most prestigious science prize for ‘hydrogels’; How far back, evolutionarily speaking, do circadian rhythms go in animals?