Did you know? Mass of an old-style London bus (AEC Routemaster) (7,470 kg) is 40 thousand x Mass of an iPhone 7 Plus smartphone (188 g)
Time since earliest wheeled vehicles (4,000 y)
/fact/time-since-earliest-wheeled-vehicles
Link
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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