Three new studies underscore the ways in which dogs meaningfully communicate with and understand humans, starting as puppies.

Thousands of bugs, bacteria, and fungi live in your home. You may think most live in your toilet, but it isn't the dirtiest place in your home.

The winners of Nikon's Small World microscopy competition reveal the hidden structures of leaves, eyeballs, butterfly wings, and table salt.

Tardigrades are microscopic creatures with "noodles for legs," as one expert describes it, but they manage to walk like insects.

We asked a dermatologist to explain why some men lose their hair, and why male pattern baldness can strike early in life.

In 2017, Americans spent $124 billion on dental visits. An estimated 90% of adults in the US have fillings. Here's why we can't regrow our teeth.

If you look inside a rattlesnake rattle, nothing will spill out. Unlike a maraca, it produces its sound by clicking keratin segments together.

A NOAA expedition spotted marine animals living a mile under the Atlantic waves. Two of those creatures resembled their cartoon counterparts.

The blobfish was crowned the world's ugliest animal in 2013 - a title it still defends today. But drop it 9,200 feet below sea level, and the water holds up all that flab like a push-up bra, making the fish a little more handsome.

Turns out, holding in your pee for too long can lead to some pretty big problems down the line. But you'll be okay if you only do it once in a while.

Caterpillar fungus has been used in traditional herbal medicine for many centuries and can cost as much as about $63,000 per pound.

A study suggests sperm can survive on Mars for 200 years. The findings "are essential for mankind to progress into the space age," said its co-author.

By studying ancient shark scales collected 3 miles under the Pacific waves, experts found that the animals almost went extinct 19 million years ago.

A spacecraft carrying tardigrades crash landed on the moon in 2019. In a new study, scientists set out to test whether the creatures survived.

A new study suggests sharks use the magnetic field to orient themselves on long migrations. They're far from the only animals with that sixth sense.

Raw oysters are still alive - or freshly killed - when you eat them. Many think keeping them alive longer makes them safer to eat, but that's not the full story.

A shark's skin is made up of thousands of armor-like scales, known as denticles. Now, humans are copying that pattern to fight the spread of bacteria.