Microscope advancements

• Ancient Greeks viewed through a water-filled glass sphere
• Hans and Zacharias Jansen used two lens to extend the reach of the human eye
• Robert Hooke, used three lenses to discover cells
• Antoni Van Leeuwenhoek used single lens that is similar to a magnifying glass, discovered single-cell organisms.
• Compound Light Microscope used 2+ curved lenses, and a light source to magnify objects.
• Robert Brown, used a single lens microscope to discover the nucleus.