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He did call some things about tech. Some stuff in welding helmets are basically out of his book, minus hitting the buttons with your chin. He...

Heinlein's idea of citizenship in the Terran Federation was also more about only those who have proven investment and willing to die for the...

John Steakley's Armor is what you're looking for when it comes to early powered armor stuff, it's just set dressing for Heinlein, he was too busy...