Did you know? Period of Halley's Comet's orbit (75.3 y) is 40 x Period of Mars's orbit (1.88 y)
Mass of an iPad Air (470 g)
/fact/mass-of-an-ipad-air
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If this was a standard unit ...
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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