Dinosaurs evolved into some of the largest animals ever to walk the Earth, but a new mathematical model suggests that early mammals may have crowded them out of the ecological niches reserved for the smallest creatures.

The post Why Were There No Tiny Non-Avian Dinosaurs? Mammals May Have Been to Blame appeared first on Sci.News: Breaking Science News.

New research from Columbia University found that adults who cut their sleep by about 80 minutes for six weeks packed on a pound (0.45 kg) and moved less during the day.

The post Losing Even 80 Minutes of Sleep a Night Linked to Weight Gain appeared first on Sci.News: Breaking Science News.

For decades, paleoanthropologists assumed that hominins -- the lineage leading to modern humans -- gradually grew larger over millions of years.

The post New Study Challenges Long-Held Idea that Our Ancestors Simply Got Bigger Over Time appeared first on Sci.News: Breaking Science News.