Figure 2: Pennies after cleaning.

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…

Skip to toolbar