Of the 24 Nasa astronauts who travelled to the Moon in the Apollo missions of the 1960s and 1970s, just five remain.
Related stories
Quantum Latin squares cannot solve Euler's 36 officers problem without entanglement
Can 'digital twins' help California manage its growing flood risk?
Scholar's work in South America helps fight Chagas disease in the U.S.
Crocodiles can't fly. Birds can. Scientists have finally figured out why
Fishers detonate a bomb every hour on one Indonesian coral reef
Rings forged from meteorites may have been fashionable among ancient Greek elites