I've heard from a friend who used to work in Houston refineries, that it's not unusual for refinery workers (who do carry mobile phones, by the way) to call their brokers immediately when they hear an explosion or see an unexpected plume of smoke from a neighboring refinery. Also smoking on the job is apparently much more common at refineries than I would have expected. Edit: this comment reflects the state of the in…
I once read an argument (maybe here on HN, I'm not sure) that if insider trading were legal, Enron wouldn't have taken anybody by surprise. I'm not sure I buy the argument that it should consequently be legal, but it's an interesting idea.
There was a Planet Money podcast about this [0] that if I remember correctly said it wasn't even explicitly illegal in the US until relatively recently. It was considered theft to take insider knowledge, but not illegal to trade on it.
[0] I think it's this one: https://www.npr.org/sections/money/2015/12/23/460689797/epis...