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The Marimba Virtuoso’s Desktop Planetarium

Cars That Think

This 6-minute documentary, about the restoration of a 1758 grand orrery —so called because it includes the outer planets—is worth watching because it shows the internal gears and clockwork mechanisms: A predecessor to the orrery was the armillary sphere , which featured a ball representing Earth at its center and stars rotating around it.

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Test of Planet-Cooling Scheme Could Start in 2022

Cars That Think

Up there, 10 to 50 kilometers above the Earth’s surface, ozone molecules absorb the sun’s ultraviolet light, protecting life far below. She points to existing international efforts, such as those to reduce greenhouse gas emissions or distribute COVID-19 vaccines, that have struggled to balance the needs and desires of disparate populations.

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