tooth enamel

Ben Krasnow of Applied Science uses a scanning electron microscope to compare new and worn toothbrush bristles. He shows how the microscopic texturing wears down with use.

Periodic Videos visits a fluorine expert to show how reactive the element is in action. It also includes a discussion of fluoride and tooth enamel.

A 56-minute fake BBC nuclear attack news broadcast originally made by Ben Marking, re-uploaded in full resolution. It is a fictional breaking-news special depicting nuclear war, and the uploader states it is not real.

BJ Fogg of Stanford's Persuasive Tech Lab argues that lasting change comes from tiny habits, such as flossing one tooth or doing one pushup, anchored to things you already do.