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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How Spending Changed for Different Income Groups
I compared spending in 1996 against the most recent spending estimates from the Bureau of Labor Statistics.
Percentage of People Who Married, Given Your Age
Or, given your age, the percentage of fish left in the sea. Here’s a chart.