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I like the active grill block ideas. I thought of a similar setup but using a spring and electromagnet for simplicity.
Re: flying cars - I know people who can't walk in a straight line, and I see a lot of drivers who can't handle traveling in 3 dimensions, let alone adding in a 4th; and let's not get into the care and maintenance of these vehicles. I'm rather happy that we don't have 85 year old cataract and arthritis patients going around in missiles. I'd much prefer to see less travel being necessary than giving people a much more efficient way to kill themselves.
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