video 7'52 : https://youtu.be/mTzHxNMK0bU : Explore Leeuwenhoek's incredible discoveries in this New York Times' animated video. : https://www.nytimes.com/2014/09/16/opinion/animated-life-seeing-the-invisible.html

text 236 words : Enhancing the Microscope Image : https://www.cellsalive.com/enhance0.htm

Photomicrography Competition : https://www.nikonsmallworld.com/Marvel at the scope of still and live video microscopy by the best in the field at Nikon's Small World.

Cell Theory Quiz: Test Your Knowledge! : https://www.proprofs.com/quiz-school/story.php?title=cell-theory-quiz-i