Sight full lesson: http://ed.ted.com/lessons/how-do-pregnancy-tests-work-tien-nguyen
Non-prescription pregnancy examinations provide possibly life-changing outcomes with a quite high rate of accuracy. However just how do they function? Tien Nguyen describes just how each test does a scientifically rigorous, multi-stage experiment that goes throughout in the time that it’ll take you to watch this video clip.
Lesson by Tien Nguyen, animation by Andrew Foerster.