Math: how long it would take 2 million people to fart enough hydrogen to fill the Hindenburg?

A calculation that's part of 14 Fart Facts for my Flatulent Friends by Hank Green:

The Benjamin Franklin essay entitled Fart Proudly (in which he suggested something similar to Beano) was left out of the printed collections of his writings for a long time, but is now available. Wikipedia has some background on the exchange of correspondence of which it was a part.

Related:

Ben Franklin's 200+ synonyms for “drunk”.

One minute science video lesson of the day: How A Bean Becomes A Fart.

Is it easier to fart while standing up or lying down?

via Laughing Squid.