An electric eel can produce a shock of up to 650 volts. The shock of accidentally getting a glimpse of your naked PE teacher changing in the locker room can be lethal.

There has been only one case in the world involving a person with 'immortal cells'. Immortal cells are cells that can divided indefinitely outside of the human body - normally there is a limit called the Hayflick limit. In 1951, Henrietta Lacks was diagnosed with cancer and she died within a year. Unknown to her and her family, a doctor took samples of her cancer cells for his own personal study. They were then passed on to other doctors for study. The doctors were astounded when they discovered that the cells from her tumor had an active version of the telomerase enzyme (the mechanism by which cells age) which also caused them to proliferate abnormally fast. The cells were then propagated and passed on to other scientists. Today the cell line is known as the HeLa cells and there are so many around today, that they weigh many times more than Henrietta weighed when alive. The cells have been used in research for polio, cancer, AIDS, for mapping genes, and many other things. Today they are so common that they often contaminate other cell cultures and have rendered some biological studies invalid because of their presence.

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