World’s biggest waterfall? It is three miles wide and 400 feet high—ten times the size of Niagara Falls—and had plunge pools at its base suggesting the erosive power of an immense flow of water. Now nearly all the water is gone from this region (an island of wheat, above). In what U.S. state is it located?
A. Alaska
B. Colorado
C. Arizona
D. Washington
Papyrus and periods: A sandstone hieroglpyh dating to 2250 B.C. shows the goddess Isis, her son, and the god Hathor (far left). There is evidence Egyptians used papyrus to manage their menstrual flow.
Related: How COVID interferes with your period
Also: How do women deal with having a period ... in space?
Today’s soundtrack: Spirit 2.0, Sampha
We hope this newsletter brightened your Thursday! It was curated and edited by David Beard, Nancy San Martín, and Jen Tse. Know someone who might want our newsletter in their inbox? Here’s the signup. See you tomorrow!
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