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It happened over 300 years in Holland. Anton van Leeuwenhoek (AN-tun van LAY-vun-hook) had a new microscope that he had . One day he through it at a drop of lake water. What he saw surprised him.

The water was alive with what Leeuwenhoek called "wee beasties." The microscope made tiny organisms look 200 times than life size. Leeuwenhoek was one of the first scientists to see living things that were that . His work was a giant for science.

Today, microscopes are much stronger. An electron microscope can make tiny organisms look 200,000 times size. A few electron microscopes can see individual atoms. Pictures can be made to show the objects or organisms much bigger. The pictures add greatly to what we know about tiny objects and . Microscopes have come a long way in 300 years!

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