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11 of the World's Worst Serial Killers
people.howstuffworks.com/10-worlds-most-prolific-serial-killers.htm
Some serial killers have murdered more than 100 people. Who are the worst serial killers, and why did they do it?
How Cells Work
science.howstuffworks.com/life/cellular-microscopic/cell.htm
The human body is composed of about 10 trillion cells. Everything from reproduction to infections to repairing a broken bone happens down at the cellular level. Find out all about cells.