Breathe. As your lungs expand, air fills 500 million tiny alveoli, each a fraction of a millimeter across. As you exhale, these millions of tiny breaths merge effortlessly through larger and larger ...

A group of mathematicians has shown that at critical moments, a symmetry called rotational invariance is a universal property across many physical systems. For more than 50 years, mathematicians have ...

Learn about the standard model of particle physics, the most accurate physical theory yet. Our laws of physics are equations of motion, along with some associated constants. We’ve talked about the ...