Human Gateways

By Alan Silverstein, ajs@frii.com
Last update: January 25, 2017

Just for fun, this is a personally-collected list of "knickpoints" in the history of the universe, Earth, and humankind, when things had to go "just right" for us to be here now as we are. Each point is described only briefly; you can web-search for more information.

Yes I know about the anthropic principle. Even the weak form says, "no fair being amazed that we are here to be amazed." Well heck with it, I still find it interesting to ponder a list like the one below.

Note too the related topic of the famous Drake equation, which estimates the number of communicating civilizations in our galaxy.

OK, here's my list:

OK, that's my list. Am I missing anything? Email me.