One of my least favorite electrical engineering courses in college was on signals and communications. I remember there being a lot of Fourier Transforms. I also remember falling asleep a lot, because it was a two-hour lecture with the lights turned off. Maybe if the demos were more visual like this, I would’ve stayed awake. (Probably not.)
Visual introduction to the Fourier Transform
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Most Common Jobs, By State
Instead of looking at only the most common job in each state, I found the top five for a slightly wider view.
Change in Common Household Types in the U.S.
In the 1970s, the most common household type in the U.S. was a married couple with kids. Things are different now.