The Invasion of the Zebra Mussel

The first day of June 1988 was sunny, hot, and mostly calm—perfect weather for the three young researchers from the University of Windsor who were hunting for critters crawling across the bottom of Lake St. Clair. Sonya Santavy was a freshly graduated biologist aboard a 16-foot-long runabout as the whining outboard pushed the boat toward the middle of the lake that straddles the United States and Canadian border.

Source: The Invasion of the Zebra Mussel

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How to Weigh the World

tlas knew the answer. Straining under the task of holding up the Earth, this Titan god likely got a good idea of how much the Earth weighed. But none of us are so conveniently situated. How could a mere mortal, a tiny person residing on Earth’s surface, carry out their own estimate of Earth’s weight? Where would—where could—you possibly place the scale?

Source: How to Weigh the World