Well not everything, but a major piece to the puzzle: their size. In a crushing blow to the collective conscious and the imagination of children everywhere, scientists announced that dinosaurs probably weren’t as big as once believed. They cite the Apatosaurus louisae—one of the largest dinosaurs and coolest attractions at the Museum of Natural History—as an example. According to new research, it likely only weighed 18 metric tons instead of 38 making it about as heavy as one of these Caterpillar trucks. |ScienceDaily|