Contrary To What You Might Think, Mirrors Don't Flip Your Image Horizontally.

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If you've ever wondered why mirrors seem to flip images horizontally, this video is for you. Dianna Cowern, better known as YouTube star Physics Girl, investigates the causes behind the way things look when seen in a mirror and finds some interesting answers.

We tend to only think of an image being flipped vertically (y-axis) or horizontally (x-axis), but in a mirror the image is being flipped through itself like an inside-out glove (along the z-axis).

Cowern started her channel after studying at MIT and the Harvard-Smithsonian Center for Astrophysics, originally as just a side project. Since then, it's grown into a resource for teachers, entertainment for science lovers and a way for her to advocate for more women in the sciences.