1. The egg yolk from an ostrich egg is the largest cell. They are about a half foot long.

2. Scientists call animal and plant cells 'eudaryores' because they are so organized.

3. We have 23 pairs of chromosomes (that's 46 in all) in almost all of our cells.

4. Ocean plankton produce 70% of Earth’s oxygen through photosynthesis.

5. If you took the D.N.A. from a single mammalian cell (remember we're mammals) and stretched it out, it would be 5 feet long.

6. 20% of your D.N.A. doesn't code for protein or regulated genes. Nobody knows what it does.

7. In 1947, Barbara McClintock discovered that some genes actually move around in the chromosomes. She called them jumping genes!

8. In 1665, Robert Hooke invented a better microscope. He also invented the word 'cells' after the small rooms in which monks lived.

9. Bacterial cells are some of the smallest of all cells.

10. More than 99% of one person's DNA is the same as everyone else's.

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