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Re:Capacitance Electronic Disc by m-i-l on Sunday November 22, 2015 @09:33AM (#10610138)
A short discussion about these on HN a month or so ago:

https://news.ycombinator.com/item?id=10364797

Re:Capacitance Electronic Disc by desdiv on Sunday November 22, 2015 @10:12AM (#10610253)
FYI HN recently added a "past" link that takes you to previous discussions.
Re:Capacitance Electronic Disc by Dylan16807 on Sunday November 22, 2015 @10:58AM (#10610411)
That's a nice idea, but it doesn't say until you click whether there are any previous discussions. Better to have someone point out the uncommon case where there's something interesting.