Cleaning Pennies with Taco Sauce
I have been collecting old pennies for a science experiment. (The composition of the penny changed in 1982, which changed the weight slightly, and I will soon have a student exercise that makes use of that weight difference. Stay tuned…) …
Vernal Equinox 2019
What a difference a year makes. Last year I made a time-lapse video of the Vernal equinox in Wooster Hall by standing next to a wall and taking a photo about once a minute for an hour. This year I…