According to the 30 greatest Albert Einstein quotes the only two that had anything to do with stupidity are:
1. Two things are infinite: the universe and human stupidity; and I’m not sure about the universe
2.The difference between genius and stupidity is that genius has its limits.
…nothing about hydorgen. You can find people attributing this quote to Einstein on various and sundry chatroom forums but on those sites that seem to have some kind of cross checking in place his name does not appear to be connected with that statement. According to quoteworld and a couple of other sites that turn of phrase is credited to Harlan Ellison
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