When did Modern Marvels Season 9 Episode 21 air?
Modern Marvels Season 9 Episode 21 aired on June 4, 2002.


HISTORY’s longest-running series moves to H2. Modern Marvels celebrates the ingenuity, invention and imagination found in the world around us. From commonplace items like ink and coffee to architectural masterpieces and engineering disasters, the hit series goes beyond the basics to provide insight and history into things we wonder about and that impact our lives. This series tells fascinating stories of the doers, the dreamers and sometime-schemers that create everyday items, technological breakthroughs and manmade wonders. The hit series goes deep to explore the leading edge of human inspiration and ambition.

Who could imagine life without our "man-made weather"? On cold winter nights and hot summer days, we are forever grateful to the visionaries who took two basic elements–fire and ice–and turned them into true modern marvels. Fire warmed the caves and primitive dwellings of mankind for centuries, yet the technology of keeping cool lagged far behind as we learn in this chronicle of heating and air conditioning that covers advancements from the home and industry to outer space and beyond!
Direct answers for episode-level questions and details.
Modern Marvels Season 9 Episode 21 aired on June 4, 2002.
This episode runs for approximately 44 minutes.
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