### Fermi Problem Friday

Fermi Problem Friday

Movies movies movies. Movies are fun. You sit back, relax and entertainment erupts right before your eyes. That reminds me, the new Jonas Brothers movie is coming out soon.
Oh how I digress. Anyhow, you often feel hungry or sleepy during the film. Hunger is your body's way of telling you that the tummy meter is running on empty. And sleepy is the result of insufficient fuel in the tummy tank. Movies theaters know this about your body and that is why they offer a variety of delicious items: everything from popcorn to Swedish Fish. You don't want to be caught snoring by the significant friend/person next to you.

This brings us to our Fermi Problem:
How much energy do you get from digesting one piece of popcorn. Assuming you went for all the buttery yummyness. And how many pieces does it take to give you enough energy for the duration of the film. Assume it's not the Jonas Brothers. That might take more.
Popcorn being as expensive as it is at theaters and with economy the way it is, this is a very important question.

Funfact: Movie theaters make more money on concessions than ticket sales.

### How 4,000 Physicists Gave a Vegas Casino its Worst Week Ever

What happens when several thousand distinguished physicists, researchers, and students descend on the nation’s gambling capital for a conference? The answer is "a bad week for the casino"—but you'd never guess why.

### Ask a Physicist: Phone Flash Sharpie Shock!

Lexie and Xavier, from Orlando, FL want to know:
"What's going on in this video? Our science teacher claims that the pain comes from a small electrical shock, but we believe that this is due to the absorption of light. Please help us resolve this dispute!"

### The Science of Ice Cream: Part One

Even though it's been a warm couple of months already, it's officially summer. A delicious, science-filled way to beat the heat? Making homemade ice cream.

(We've since updated this article to include the science behind vegan ice cream. To learn more about ice cream science, check out The Science of Ice Cream, Redux)

Over at Physics@Home there's an easy recipe for homemade ice cream. But what kind of milk should you use to make ice cream? And do you really need to chill the ice cream base before making it? Why do ice cream recipes always call for salt on ice?