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A DAY AGO
It’s a Greek letter and a guy’s name. What does it mean?
Take our quiz to find out.
- SCIENTIFIC AMERICAN16 HOURS AGO

60 years ago NASA took the first ever photo of Earth from the moon—and began a legacy
Snapped on August 23, 1966, by the uncrewed Lunar Orbiter 1, the photo's legacy lives on in the breathtaking images of Earth taken by the Artemis II crew
- SCIENTIFIC AMERICAN15 HOURS AGO

How “thunderquakes” could help reveal hidden structures inside the Earth
When that energy reaches the ground, some of it is converted into seismic waves that ripple through the soil and rock beneath—"thunderquakes"