Good evening, ladies and gentlemen. And welcome to the sixth session of the V-50 Lectures. I’ll begin tonight’s lecture with a question, namely, how did man, in just three hundred years, progress from a vehicle called a horse drawn carriage to a vehicle called a rocket ship? That’s quite a large magnitude of progress. Who were the men responsible for this achievement? And if most of them have been dead for centuries, then why bother to discuss the subject in the first place?