This piece in The Atlantic reviews two new books which make the case that the single most important turning point is… the discovery of dinosaur bones. That's right - this one moment in 1811 ...

Fossils of alvarezsaurid dinosaurs show bird-like air sacs in their bones. Scans revealed hollow spaces connected to their ...

Brazilian paleontologist Tito Aureliano found that hollow bones filled with little air sacs were so important to dinosaur survival, they evolved independently several times in different lineages.