If you read only one patent application this year, read PHOTON PUSH-PULL RADIATION DETECTOR FOR USE IN CHROMATICALLY SELECTIVE CAT FLAP CONTROL AND 1000 MEGATON EARTH-ORBITAL PEACE-KEEPING BOMB.
It starts with a method to have the pet door let in the inventor's cat but not his neighbor's, but near the end of p.3, the cat explains how the device might have an additional use.
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