You have no idea. His life story is truly amazing; he wrote an autobiography, if you're interested. It will forever blow my mind that I was lucky enough to have him as my grandfather, and they don't come any better as far as role models go. Dude was a ****ing genius -- like, a genius's genius. He also invented something called the "thermal shroud" (look it up, fascinating stuff) for the Israeli army's Merkava tank gun barrel during the 1982 Lebanon War, which he regarded as his most important and prideful accomplishment because it directly impacted the nation's ability to defend itself and survive.