Find out how and why Mendeleev invented his periodic table of the elements and how he used his table to predict unknown elements.
Find out how X-rays were discovered and how the use of X-rays revolutionized science and medicine.
Learn why almost everything in the universe depends on atoms, how the idea of atoms came about, and how science might have been different if the idea had been accepted sooner.
Find out why the accidental discovery of electromagnetism made much of modern life possible because so many modern devices use electromagnets.
Find out how the ability of modern chemists to develop life-changing materials such as plastics depends on knowlege of atoms that was first introduced by John Dalton around 1800.
Find out how the U.S. electrical grid came to carry alternating current and why direct current might make more sense today.
Learn about the first female photographer, how to make prints with UV light as she did, and how the process works.
Learn the history of the wheel and axle and why it has been called one of the most important inventions of all time.