Very occasionally, African clawed frog tadpoles never stop being tadpoles and turn into frogs. They increase in size, and they reach a form of sexual maturity, but they look eternally young. And then things get grotesque.
It is becoming more and more difficult to define sex in binary terms.
Science-visualization wunderkind Eleanor Lutz continues to raise the bar for animated infographics with her latest creation, a hypnotizing guide to embryonic development.
Everyone on Earth has been through it, but there’s a lot about birth that you’re probably unfamiliar with. Here’s thirteen facts about the human birthing process you may not have picked up in biology class.
Our bodies may be (nearly) symmetrical on the outside, but our insides are a different story. Your heart, your stomach and spleen are all on the left side of your body, your liver on the right. But in one in 20,000 people, the sidedness of the organs is reversed.
In a major scientific first, a team of developmental biologists has built a functional mouse heart from human tissues. The results herald a future where specific patches of heart muscle – or even the whole organ – could be grown for transplantation.
Why do some salamanders regenerate limbs faster than others? A team of biologists has identified genetic factors that may dictate the rate at which limbs and organs re-grow in these incredible amphibians, shedding much-needed light on one of the most remarkable physiological feats in the animal kingdom.
Australian researchers have isolated an immune system cell in salamanders which helps it regenerate missing limbs and damaged organs — and they suspect the same thing could work in humans, too.
A handy explainer for the oft-cited (but rarely elucidated) factoid that every single person on Earth was once female — or, at a minimum, gender-neutral.
This beautiful image of a skate fish embryo reveals something truly extraordinary about the scales on its body. As University of Cambridge biologist Andrew Gillis explains, they are, in fact, quite similar to human teeth. They're even controlled by genes similar to those that control tooth growth in humans. You may…
A fertilized, incubated chicken egg takes about 21 days to hatch; and while most of us have seen what chicks look like at either end of the developmental spectrum (either sunny-side-up in a frying pan or newly hatched in a nature documentary), the fact that egg shells aren't see-through means that not many people have…
We've seen parents-to-be in sappy movies putting headphones or speakers up to the pregnant woman's stomach. Sometimes they're trying to make the fetus listen to some grandparent's voice. Sometimes they're trying to make some kind of crazy-smart super baby. But can a fetus stuck behind thick walls of flesh hear any of…
Human infants start life with ape-like brains. Now scientists are saying that the parts of the brain that develop the most during childhood are the exact same parts that changed most dramatically when apes evolved into humans.
For the first time, scientists have captured on video what happens when stem cells are born. Now they know where blood-making stem cells form in the body, and what the process looks like. Their research could help with leukemia therapies.