How to multiply numerals with multiple digits graphically. Very cool. Now I can get rid of my TI Datamath.
Sorry to have to state the obvious, but the people who marched for “Climate Change” are idiots.
Very cool audio/visual display of pendulum motion [via]. Visual demo of sound waves, mathematical sine wave congruences, electronics, physics, gravity, art and bowling all in one. Surprising stuff happens about 1:00 in. There’s medical info in the video as well – one of the kids has whooping cough. I haven’t heard that sound since I was in 3rd grade. [A screencap of the video is the source of the top image.]