By the author of SmarterEveryDay Youtube channel.
"I Was SCARED To Say This To NASA... (But I said it anyway) - Smarter Every Day 293"
A speech to the American Astronautical Society, comparing the program to get back to the moon with what was written after the first visit to the moon, a real eye opener about speaking up. e.g., The current program requires in space refueling from EIGHTEEN rockets because of the orbit sequence, eighteen!
https://www.youtube.com/watch?v=OoJsPvmFixU