Khan Academy
Khan Academy: Pre Calculus: Exponential Growth
Video in which the instructor does a four-part example problem dealing with bacteria growth. The basic exponential growth equation is given, and it is used in a different way to solve each part of the problem. Natural logarithms are used...
Science for Kids
Science Kids: Biology Videos: Bacteria Growth Video
Watch this video to understand how one bacterium can multiply into many billions in the space of just one day. (Length: 16 sec.)