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Some people have extraordinary powers of mental time travel

An astronaut-turned-aquanaut made history on a long-distance call with friends

Learning how to cope with heatwaves, from an ultrarunner

The cave-dwelling olm is a canary in the coal mine for environmental change

Effective CPR is hard when both patient and rescuer are floating

Peeking inside deep-sea rocks has offered a clearer timeline for an oxygen-fueled burst of animal evolution

High temperatures can alter our bodies at the molecular level

A new study predicts massive population declines in the Arctic

New maps of the brain may explain why amputees feel pain in the void

From cells to cellphones, trial and error shapes it all

From molten glass rain to oceans of lava, an intergalactic tour of the most terrifying and beautiful climates out there

The dwarf planet might have had a hot core and liquid oceans