How We Got to Now 2of6 Time 720p x264 HDTV

"how we got to now 2of6 time"
http://docuwiki.net/index.php?title=a_brief_history_of_time

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correct docuwiki link:
http://docuwiki.net/index.php?title=how_we_got_to_now

the series doesn't cover heat. surely that's important.

also, we had refrigeration as early as 400 bc in the form of yakhchals in persia.
this is obviously well before 200 years ago.