>>And multiple layers of silk (done in some manner I don't have the details for) work well against arrows.<<

Murdoch Mysteries used that in an episode once. (For anyone unfamiliar with the series, it is basically CSI set in the 1890s.)

>>I figured out how to make calcium carbide and got rich selling explosion proof lamps to miners.<<

Did you ever read any of the Ring of Fire books? The time travelers essentially ended up doing a lot of stuff like that.

>>We will draw a curtain over the nuclear reactor plans... :-) <<

And the glow-in-the-dark makeup plans? ;)