Every field of science has its favorite anniversary. For physics, it’s Newton’s Principia of 1687, the book that introduced the laws of motion and gravity. Biology celebrates Darwin’s On the Origin of ...

Atoms are made from protons, neutrons and electrons. The periodic table arranges elements according to their atomic size and other properties, atomic theory and atomic numbers.

When wading into the murky realm of theoretical physics, one of the more difficult concepts for scientists to explain is that of dark matter. It’s the invisible form of matter constantly eluding ...

One hundred fifty years after Russian chemist Dmitri Mendeleev published his system for neatly arranging the elements, the periodic table it gave birth to hangs in every chemistry classroom in the ...

For the first time, a research team from the University of Cologne has observed the electron capture decay of technetium-98, an isotope of the chemical element technetium (Tc). Electron capture decay ...

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 ...