Gray and blue eyes both have very little pigment. The difference is in how the front of the iris scatters light. Here's the science, how rare gray eyes are, and why they…
Close your eyes and picture an apple. Some people see nothing at all. Aphantasia was only named in 2015, and many people don't know they have it. What it is, how common…
Name any date and they can tell you what day of the week it was, what they did and what was in the news. Highly superior autobiographical memory is real and very…
For some people, the letter A is always red and a C chord looks blue. Synesthesia is real, more common than people think, and runs in families. The types, how it works,…
Freckles come from genes and sunshine together. Why some people get them and others don't, why they fade in winter, how they differ from sun spots and moles, and when to get…
Anesthesiologists have long joked that redheads need more anesthesia. Studies back it up, at least partly. What the research found about redheads, pain and anesthetics, and what it means at the dentist.
Natural red hair is the rarest hair color in the world. The gene behind it, where redheads are most common, how two brown-haired parents can have a redheaded child, and the myths…
Some comedians aren't joking when they pick up an instrument. From Steve Martin's bluegrass Grammys to Tim Minchin's musicals, the comics who are legitimately great musicians.
Comedy and horror run on the same thing: timing. Comedians who crossed over to make some of the best horror films of the last decade, from Jordan Peele to Zach Cregger.
Eight common blood types, ranked by how often they show up in the U.S. population, plus who can give to whom and why O-negative donors are always in demand.
Only a few dozen people on Earth have been reported to have Rh-null blood, nicknamed golden blood. What it is, why it's so valuable, the health challenges, and how it was discovered.
One blue eye and one brown, or a splash of a second color in one iris. The three types of heterochromia, what causes them, how rare it is, and why it's common…
