The word "we" in the post title doesn't mean me or you, because I haven't got a clue, but scientists who know what temperature many species of dinosaur had when they were alive. I didn't even know those had been discovered at all. Al we have left of those dinosaurs are fossilized bone and a few impressions from skin, feathers, and footprints. But chemical analysis has detected a chemical called bioapatite, which sounds like something that makes you hungry. The study of this molecule tells us that dinosaurs were warm-blooded, or at least many that we know about, which makes them different from the reptiles we studied in grade school.
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