The microscope is the most influential technology that allowed us to study and observe things that we could not be able to see with the naked eye. The microscope helps to identify viruses and diseases; these discoveries led to preventative measures such as vaccines. Zacharias Janssen, a Dutch lensmaker, was the first to realize that by inverting the lens structure of early prototype telescopes, we could get a higher degree of magnification. The initial microscopes were simple compound types, combining a magnifying objective lens with an eye lens. Advancements soon followed though and, after Robert Hooke published Micrographia in 1655, the microscope became a staple tool for any scientist.
