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Currently you are able to watch "How 2 - Season 3" streaming on Amazon Prime Video, Amazon Prime Video with Ads.
How 2 is available to watch for free today. If you are in Canada, you can:
How 2 is a world-famous children's programme dedicated to science and general trivia. Originally aired in 1966 under the title How, TVS brought it back to life in 1990. Though the name was changed, the format stayed the same: Three presenters sit around a table, and ask rhetorical questions