My homework?
I first heard about methane on a high-school band bus trip, in 1960 give or take a few years. We were playing cows and horses, where each side of the bus gets one point for a cow and 10 points for a horse seen on their side. If a cemetery appears on one side of the road, the other side calls out "Boneyard!" resetting the opponent's count to zero. Some of the older players would hold their noses and shout "Methane!" whenever a manure pile was sighted (no effect on scores) since a recent Biology class lecture had concerned methane production from manure. That is, of course, misleading, since methane is odorless and the offending odors are more likely ammonia and sulfur compounds.
