13th Amendment criminal punishment convict leasing

The 13th Amendment left a forced-labor exception

The U.S. 13th Amendment abolished slavery but allowed forced labor as criminal punishment. That exception provided a legal basis for convict leasing, a practice that primarily affected African Americans.

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Ingenuity spun its blades fast on Mars

Nearly 3,000 Rpm

NASA’s 1.8-kilogram Ingenuity helicopter flew in an atmosphere 100 times thinner than Earth’s. Its blades spun at about 10 times the speed of a helicopter on Earth.

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From the Moon, Earth eclipses the Sun

During a lunar eclipse, Earth moves between the Moon and the Sun. Seen from the Moon, Earth blocks the Sun, and its atmosphere looks like a red ring around the dark planet.

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