Hello, PF! Days ago, while playing Batman: Arkham Origins, I was wandering through the Batcave when I noticed something that caught my eye immediately. There's a nice, cozy lab in there which includes a blackboard where Bruce Wayne apparently did some kind of thermodynamic calculations, which look like the ΔG of transformation of aragonite to calcite. Maybe he's studying those minerals to create a cloak of invisibility? Thermo has always been one of my favorite subjects since high school, and I lost it when I saw those equations inside the game. I thought some of you may find this interesting too.