April Whitehead
Sites for science, technology, engineering and math.
Science Behind the News NBC Learn, in partnership with the National Science Foundation, explores the science, technology, engineering and math found in current events. Check back regularly for additional videos that help connect fundamental STEM topics to real-world news stories. If you are having trouble viewing the videos, click here.
Notes Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification.
Biology game
