function, x squared plus y squared minus cxq equals zero. i'm speaking truthfully, sir. you spoil my respect for the future of prussian mathematics. >> wow. i'm joined right now by the executive producer, the legendary ron howard. ron, this is fascinating because, you know, we're talking a lot in politics. you watch politics about immigration, and here's probably our most famous immigrant ever. >> yes. >> we lucked out and got him. he came here. tell us that brief story. he got here. he got past hitler just at the right time apparently. >> well, he had been on a hit list for years and finally his second wife, elsa, implored him to finally go and leave germany. and at that point there were some groups in the united states, conservative groups that had him on a list, and j. edgar hoover was responsive to that and that influence and sort of tried to keep him out and block