Slideshow of mitosis and meiosis side-by-side. It is a summation of the two processes and the differences between them are clear.

Watch webcast coverage of a total eclipse of the sun. Slideshows and animations explain how this exceptional space event takes place.

Powered by up-to-date news from NBC sports, this website not only tracks events, profiles athletes, and shares behind-the-scenes commentary during the Olympic Games, but also offers a look pre- and post-Games happenings: trials,...