Bumps on ancient, armored fish may have given rise to teeth in animals, study finds

Sensory features on the armored exoskeletons of ancient fish may be the reason why humans have teeth that are sensitive to cold and other extremes.

​ Sensory features on the armored exoskeletons of ancient fish may be the reason why humans have teeth that are sensitive to cold and other extremes. Read More Breaking News, Latest News and Videos | CNN