References

Will President Trump be impeached? Here's a look at what impeachment means, how it works and who has been impeached.

Axolotls are cute, charismatic salamanders that have an almost otherworldly ability to regenerate their body parts. But pollution and urbanization critically threaten this species' survival.

People with cystic fibrosis produce a thick, sticky mucus that causes wide-ranging problems in the lungs, pancreas and digestive system.

Reference Article: A brief overview of the Enlightenment period of the 18th century.

Scientists believe atoms were created after the Big Bang 13.7 billion years ago.

Narwhals are one of the weirdest creatures on Earth.

Look! Up in the sky! It's an asteroid.... No, it's a comet.... Wait, it's neither?

The chaos of the French Revolution allowed Bonaparte to use his military prowess to become ruler of much of Europe.

Most sexually active men and women will contract HPV at some point in their lives. So, yes, you should probably get the vaccine.

Breathe in, breathe out.

Matter makes up you, me and everything else that takes up space in the universe.

Dark energy is responsible for accelerating the cosmos.

Psoriasis causes new skin cells to grow in days rather than weeks. New skin builds up rapidly, forming thick patches and scales on the surface.

Throughout history, lions have been celebrated for their strength and beauty, and are the inspiration for many myths and stories worldwide.

If you've ever had a muscle seize up, you know it's painful and can stop you in your tracks. But what actually causes muscle cramps or spasms, and what can be done about it?

There are many different kinds of epilepsy with symptoms ranging from mild to potentially life-threatening.

The heart, lungs and about 60,000 miles of blood vessels work together to keep blood pumping through our bodies.

Humans wouldn't get very far without bones — literally.

His story is perhaps the most famous on Earth, yet we know relatively little about Jesus, the man.