The "ontogeny" bit is a stray factoid from my 55+ years old high school biology class. I assume it's been invalidated by now, but the idea was that looking at the progress of the human embryo you could see the progress of the phylla (i.e. single-cell through gills to lungs, etc.)
Anyhow, on a completely different subject, here's a piece on the arms race in drones. Every country with a military seems to want to add armed drones to their arsenal. Now the evolution of aircraft went from reconnaissance and artillery spotting to bombing to hand guns and rifles to machine guns. So far drones have gone through the first two stages. I'm waiting for a drone-destroyer aircraft/drone that will seek to regain dominance over the airspace. (That's what happened on the sea when torpedoes arrived: first you had torpedo boats, then you had torpedo boat destroyers, which became just destroyers.)
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