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As the universe expands, it feels like it must be spreading out from some initial point. But a physicist explains why that's not how it works. Hint: space-time is involved.

Not everything dies in a mass extinction. Sea life recovered in different and surprising ways after the asteroid strike 66 million years ago. Ancient fossils recorded it all.

Rejection can feel physically painful. It also provides a lesson for your brain on whom to connect with and how.

Even though there are 8 billion people on Earth today, a catastrophe could send that number much lower within a few decades.

A legal scholar with a Ph.D. in wildlife genetics explains the promise biotechnology techniques hold for some animals that are currently endangered.

Missile defense systems are nothing new. History shows that even if they work as advertised - a big if - they're a bad idea if your aim is to make your country safer from nuclear attack.

In the 19th century, astronomers could see Mars through telescopes, but not clearly. Some used their imaginations to fill in what the blurry images couldn't convey.

The first Trump administration also used words like 'transparency,' 'reproducibility' and 'uncertainty' to try to block regulators from using important health studies when writing pollution rules.

How do you ensure scientific research can be trusted? The concept of reproducibility can help.

Every piece of personal data about you has inherent value. As long as there are customers clamoring for that data, breaches are likely to continue.