The Doctor looks slightly more comfortable in his skin, and also a lot more ginger. This is a good thing, and he's slurping on another can of Coke. There's an empty one on his desk, and a 6 pack near the door for everyone else's taking.
"Feel free to have a Coke, guys.
"Kay. So. Your people. You'll maybe vaguely remember that in 123, we talked about paradoxes, and the two major kinds:
predestination and
grandfather. If you don't remember them at all--predestination is when one travels back in time and ends up causing an event he or she meant to stop. Grandfather is when one causes one's own existence to be forfeit because of travelling back in time. Okay? Cool.
"To that end, I asked you to consider two events in the lives of each of your selected historical figures. If yours is really hard to find information on, one is fine. Here in class, we're going to talk about and discuss what would happen if the predestination paradox was applied to one event, and the grandfather one to another. This last might be difficult--how could you end your own existence (because all of you were born after the dates of your events) by changing said event? I don't care how wild it is, just go for it, but it should make sense and reflect how human history works.
"For Monday, I want you to look at
this book...to find out what actually happened. Then we're going to talk about how this differs from what you've decided today."
((General information about the 1970s is available
here.))