Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

If you hit an atom’s nucleus hard enough, it will fall apart. But exactly how it falls apart tells us something about the internal structure of the nucleus and perhaps about the interior of neutron ...

For four years, James Chadwick was a prisoner of war in Germany. When World War I ended, he returned to his native England to rejoin the mentor of his undergraduate days, Ernest Rutherford. Now head ...

The stuff of daily existence is made of atoms, and all those atoms are made of the same three things: electrons, protons and neutrons. Protons and neutrons are very similar particles in most respects.

When researchers look at cells under high magnification, they usually have to look at cells that have been treated with special chemical reagents and are no longer alive. But a team of scientists at ...

The most important question for physics to answer is: What is matter made of? A glass of water or a chinch bug or a copper coin is composed of molecules. The molecules are built of atoms. Twenty years ...

Basic physics suggests that electrons are essentially immortal. A fascinating experiment recently failed to overthrow this fundamental assumption. But the effort has produced a revised minimum ...

A new study suggests that the positively charged particles may have an outsize influence on the properties of neutron stars and other neutron-rich objects. Neutron stars are the smallest, densest ...

New research shows that protons released by roundworms’ intestines trigger surrounding muscles to contract, causing the worm to defecate. The discovery marks the first time that scientists have found ...