Featured in twins
What NASA’s twin study actually taught us about living in space
Results show the human body changes, but not dramatically.
A baby was born with her own twin growing inside her
Here's how fetus in fetu happens.
These Australian twins are the second ‘semi-identical’ pair ever reported
It all started with two sperm and one egg.
The weirdest things we learned this week: eating your own twin, embalmed milk, and levitating frogs
Our editors scrounged up some truly bizarre facts.
This year’s Ig Nobel prizes for unusual research honored old man ears and the fluidity of cats
And didgeridoos appeared twice.
The Fatter Twin Is No More Likely To Have A Heart Attack
What does that mean for you?
Here’s Why Twin Studies Are So Important To Science And NASA
Mark and Scott Kelly are giving scientists a unique look at what space does to the human body
A Genetic Switch Could Turn Obesity On Or Off
The next step is to figure out how to flip it
More And More Twins Are Being Born In The U.S.
Fertility treatments are a likely factor
Astronaut Mark Kelly On Life In Space
Twins Mark and Scott Kelly are key to understanding how space impacts our bodies