I watched all 157 of these: https://www.youtube.com/playlist?list=PLVV0r6CmEsFzDA6mtmKQEgWfcIu49J4nN https://www.youtube.com/playlist?list=PLVV0r6CmEsFzDA6mtmKQ

I watched all 157 of these: https://www.youtube.com/playlist?list=PLVV0r6CmEsFzDA6mtmKQEgWfcIu49J4nN https://www.youtube.com/playlist?list=PLVV0r6CmEsFzDA6mtmKQE... Really interesting. I spoke to him once at a book signing and asked him about Orion. In summary he said: would it have worked - probably, should it be done - probably not. Although he did make the point that pretty much every big engineering project kills people.