turns of the century

[kunkmiester]

With a couple of decades tolerance, the turn of a century seems to be an interesting time for science and technology and discovery. Having an interest in Tesla and his work, I realized there were some trends to large, important discoveries. My list isn't complete yet though, so I thought I'd get some input on it.

2000--Frank Znidarsic's physics paradigm based on a calculated speed of the quantum transition, and more practical work such as Bussard's Polywell reactor. On a more practical note, we also have things like the internet and 3D printing.
(links, because these probably do need references)
http://www.scribd.com/doc/25456609/Fran ... ti-Gravity
http://en.wikipedia.org/wiki/Polywell

1900--Relativity, AC power, basically the core understandings of modern physics and engineering; radio and practical form of the internal combustion engine.

1800--While the steam engine has been in development for literally ages, the beginning of the 19th century was the real start of the steam age.

1700--???

1600--???

1500--Columbus discovered America in 1492. This was also the heyday of the Renaissance.

1400--The wiki article on the Renaissance says it started in the 14th century, so this one might be a bit early. Nevertheless, if there's something here, it'd be nice. Or, since this is focused on Western civilization back to this point, some other culture might move things back farther.

I'd like to finish off the list, at least to the beginning of the Renaissance. Anything that would fill the two gaps I have?