The tongue is secured to the front of the mouth partly by a band of tissue called the lingual frenulum. If the frenulum is short, it can restrict the movement of the tongue. This is commonly called a tongue-tie. Children with a tongue-tie can’t stick their tongue out past their lower lip, or touch their […]
Shining light on night blindness
Animals renowned for their outstanding night vision include owls, cats, tarsiers (a tiny primate in Southeast Asia) — and even the dung beetle. But humans? Not so much. Over time, many people suffer from night blindness, also known as nyctalopia. This condition makes seeing in dim or dark settings difficult because your eyes cannot adjust […]