50 years ago, the dinosaurs’ demise was still a mystery
Excerpt from the July 22, 1972 issue of Science News
![an illustration of a dinosaur skeleton partly buried by debris](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/07/061422_mt_50ya-dinosaurs_feat.jpg?fit=1030%2C580&ssl=1)
Fifty years ago, scientists thought dinosaurs’ warm blood or soft eggs may have caused the reptiles to die out (illustration of a partially buried dinosaur skeleton shown). Now, mounting evidence points to a killer asteroid impact.
MARK GARLICK/Science Photo Library/Getty Images