medlineplus.gov

j65XQ TIL about Williams syndrome where affected people have outgoing, engaging personalities and tend to take an extreme interest in other people.
yVM1p TIL humans have a gene named "Sonic Hedgehog" that is responsible for shaping the brain & limbs
OGb5X TIL the Sonic Hedgehog protein is a key signaling molecule in human embryos that helps control how the brain, face, and limbs form. Without it, major body parts wouldn’t grow in the right places.