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At each step, the programmer is able to see if, and how, a variable is affected. Trace tables are extremely useful because they enable a programmer to compare what the value of each variable should be ...

Late 1600s – Dutch scientist Antonie van Leeuwenhoek constructed a microscope with a single spherical lens. It magnified up to ×275. 1800s - the optical quality of lenses increased and the microscopes ...

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