How to Make a Crystal Radio – No Batteries, No External Power (2015) [video]
41 by humbfool2 | 14 comments on Hacker News.
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Beginner's Guide to Product-Qualified Leads 4 by wesbush | 0 comments on Hacker News.
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By BY MEGAN SPECIA from NYT World https://ift.tt/x1f9RlC
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