It's Back to the Future Day, and apart from antigravity, well,
Marty McFly's 2015 looks more or less like the one we live in, only
with better food and inifinitely worse partisan tribalism. If
predicting 19 Jaws sequels is the second-worst worst flub
the series made, well, I'm good with that.
The Make Blog recently aggregated a very nice FM Crystal Radio. A diode can detect a strong FM signal via slope detection, and by "strong" we may mean "within a mile or two of the broadcasting antenna." I grew up a couple of miles from WJJD-AM just outside
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