Crack open a can

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The other day, and I kid you not, I saw someone say to someone else "would you like a soda" and the person stared back and said "why would I want a soda" and a third party repeated the question, only saying "would you like a pop" and the person said "yes, very much, thank you."
The long awaited EPA study of chemicals emitted when microwave popcorn is popped has just been published.
When you pour a beer, there is this foamy top called the head. The size of the head decreases over time. What is this process dependent on? Clearly, little bubbles of beer are popping. Does each bubble have an equal probability of popping? Do only the bubbles on the top (or bottom) pop?

My cousin Ross is a U.S. Marshal and he sometimes e-mails me with stories about the bizarre things he's seen or heard while fighting crime. I sent him the link above just to see if I could outdo him. No such luck. He reports that one of his former partners came across this very thing while serving with the Houston Police Department. Since the photo is from a bust made by the Austin PD, perhaps both stashes came from the same cartel.