The history of anesthesia in surgery was grisly, painful and occasionally very dubious.
SpaceX launched nearly four dozen satellites and landed the returning rocket Monday (Feb. 21).
It's hard to imagine we could miss creatures the size of elephants roaming the planet, but are there any giant animals humans haven't discovered?
The James Webb Space Telescope finished the first major stage in its long process of aligning the observatory's 18-segmented primary mirror.