I don't know about the rest of them, but I could use this one:
a portable device capable of protecting an area from all six-legged critters. An insect force field would allow hikers to wear what they want, sleep outside the tent and come back for a dropped candy bar an hour later and find it whole. Harmful pesticides and superfluous food packaging would be a thing of the past—so would Lyme disease and West Nile virus. Sadly, current technology is lacking: Researchers consider ultrasonic pest-control devices useless, and bug zappers—while fun to watch—kill the good insects with the bad.
(headsup Instapundit)
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