lovelace_
Use UUIDs as Keys
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Re:Video lectures of mathematics courses available online for free
on Saturday July 20, 2013 @04:50PM (#6076525)
For more recreational math, I tend to watch Numberphile:
https://www.youtube.com/user/numberphile
There's also a more-recently launched Computerphile, which has some interesting vids, as well: https://www.youtube.com/user/Computerphile