The Urine Tax of Ancient Rome.
Science: Why is the sky blue? How do bees and butterflies see? How does an igloo keep you warm?
Figure Out Where You Are With Nothing But a Watch and Protractor.
If you’re keeping track of the human feet being washed up in British Columbia, it’s time for an update (spoiler — this is number 14).
ICYMI, Friday’s links are here and are all Mother’s Day related: good and bad animal and human moms, top sci-fi moms, how grandmothers gave humans longer lifespans, and gifts for your wino mom or wife. Not included but related: The Ultimate Guide to Bizarre Lies Your Mom Told You.