This sentiment was echoed by Morris Travers, with whom Ramsay co-discovered the four noble gases—neon, argon, krypton, and ...

Xenon's discovery concluded an intense period of research on noble gases. Much heavier than neon and krypton, it had not been explicitly predicted, and was sufficiently rare to avoid chance detection.

The world’s rarest creature died in 2012. His name was Lonesome George, and he was the last Pinta Island tortoise, a subspecies of Galápagos tortoise. By most estimates, he was 100 years old when he ...