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Throughout the history of science, many major discoveries came accidentally. Sometimes they came from recognizing potential in an unexpected product or waste. Other times, discovery came out of pure desperation from a seemingly dead-end…

Chemistry research usually involves precise measurements and careful testing in order to get significant results. Sometimes, however, notable discoveries happen by accident. In this video on accidental discoveries, you will get to know the…

This animation shows how the hormone epinephrine causes liver cells to secrete glucose without crossing their cell membrane.

This animation explains how glucocorticoid hormones influence nutrient metabolism by altering gene expression in cells.

This animation explains how an electrical signal (action potential) stimulating skeletal muscle triggers changes that enable muscle contraction.

This animation explains how a specific group of proteins in blood and body fluids works with the immune system to kill bacteria and other foreign invaders in the body.

This animation shows how the presentation of antigens and the activation of helper T cells mobilize the immune system's production of antibodies.

This animation explains the difference between addition mutations, in which nucleotides are added to DNA sequences, and deletion mutations, in which nucleotides are lost.

This animation explains how the control surfaces on an airplane's wing direct its flight and shows how movements of the ailerons, elevator, and rudder change the plane's flight path.

For decades, the U.S. government issued a chemical shark repellent to pilots, sailors, and even astronauts to fend off potential shark attacks. The problem was, that substance did not actually work. This video explains why developing an…