When Robert Hooke looked through his microscope in the 1660s, he discovered cells, the basic unit of life. The cell scientists who followed have investigated the similarities and differences between plant cells and animal cells. They have studied how cells get energy, reproduce, and carry genetic information. Some cell scientists study stem cells, which hold promise for treating a variety of illnesses. For more information on cells and cell scientists, read Cells, another book in the Mission: Science series.
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