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 Use of Time, By Age and Sex
Typical time use varies by who you talk to. This interactive shows you the differences when you vary age and sex.
About 18 percent of couple households are single-income. I wanted to know what the earner in these homes usually do.