Something random:
Always surprised how many people do not know that Methan, main component of natural gas, is odorless.
@MightyPork
For real :D
The stink comes different sources.
In natural gas is it actually a deodorant that humans put into it to make it safer to use. Else most leaks would go undetected and result in a explosion.
In "organic processes" Methan is always mixed with different gases. One big source of smell are sulfur components. SH2 for example is the source of the rotten egg smell.
@turi I knew about the odorant, but always assumed the rotten eggs smell has something to do with methane. So that's actually H2S