From JayG, and mostly because it’s Greek to me yet I still got the punchline
It's just so arbitrary, I think that's my big problem with it. We have such a hard-on for solid explosives yet there are dozens if not hundreds of other items that can cause similar destruction that you can purchase without a second thought. 50 grams of PETN is a federal felony; 20 pounds of C3H8 and no one bats an eye. You put PETN, RDX, styrene, butadiene, n-octyl phthalate, and n-phenyl-2-naphthylamine together and you're going to jail; you mix 4-8% alkanes; 2-5% alkenes; 25-40% isoalkanes; 3-7% cycloalkanes; l-4% cycloalkenes; and 20-50% total aromatics (0.5-2.5% benzene) and you're going to the mall.
Pretty funny for a guy in Massachusetts.