Do you know why IMAX film runs horizontally rather than vertically? What's the difference between nitrocellulose and cellulose acetate?

What Is..., a new web series about the history of the medium of film, serves up these answers and more. Although geared toward relative newcomers, the below videos offer some fascinating insight into the mechanics and chemistry of film stock, including information about its (literal) silver lining: silver halide.

And here's a detailed answer to an age-old trivia question:

Where do you stand on the film vs. digital debate? (We already know where Jeff Nichols stands.)

Top image credit: StillFX / Shutterstock