Did you know? Time since the birth of Leonardo da Vinci (572 y) is 4 x Time since birth of Emmy Noether (142 y)
Diameter of a CD / DVD (120 mm)
/fact/diameter-of-a-cd-dvd
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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Click here for Podcast: Andrew Elliott interviewed for New Books Network.