# Want More Pizza in Your Life? Order One 18-Inch Pie Instead of Two 12-Inch Pies

iStock.com/smpics

When ordering pizza for guests (or when throwing yourself a personal pizza party), it can be tempting to spring for two medium pies over one large one. It may end up being more expensive, but it also feels like the logical choice: Two 12-inch pies should give you more cheesy goodness per square inch than an 18-inch pie, right?

That may be what pizzerias want you to think, but as Fermat's Library recently illustrated on Twitter, it's not the case. One large, 18-inch pie boasts a full 28 more square inches of pizza than two small 12-inch pies, making the larger pie by far the better deal.

Even though the diameter of the large pizza is smaller than the combined diameters of the two medium pies, it still has a larger total area. To get the area of the circle, you have to square the radius (which is half of the diameter) and multiply that by pi (about 3.14). This means the area of an 18-inch pizza is 254 square inches, while the combined area of two 12-inch pies is only 226 inches.

The geometry required to calculate your pizza order isn't too complicated, but the tweet was apparently eye-opening enough to garner a viral response. Some people were thankful for the math tip, while others had trouble wrapping their heads around it. Mathematician Tamás Görbe pointed out that while an 18-inch pie technically gives you more food, two 12-inches pies give you 33.3 percent more crust—something to keep in mind if that's your favorite part.

In case you're looking for another excuse to order pizza, January 13 marked the start of National Pizza Week. Here are some facts about the beloved dish to celebrate the occasion.

[h/t Mashable]

# The ChopBox Smart Cutting Board Has a Food Scale, Timer, and Knife Sharper Built Right Into It

ChopBox

When it comes to furnishing your kitchen with all of the appliances necessary to cook night in and night out, you’ll probably find yourself running out of counter space in a hurry. The ChopBox, which dubs itself “The World’s First Smart Cutting Board,” looks to fix that by cramming a bunch of kitchen necessities right into one cutting board.

In addition to giving you a knife-resistant bamboo surface to slice and dice on, the ChopBox features a built-in digital scale that weighs up to 6.6 pounds of food, a nine-hour kitchen timer, and two knife sharpeners. It also sports a groove on its surface to catch any liquid runoff that may be produced by the food and has a second pull-out cutting board that doubles as a serving tray.

There’s a 254nm UVC light featured on the board, which the company says “is guaranteed to kill 99.99% of germs and bacteria" after a minute of exposure. If you’re more of a traditionalist when it comes to cleanliness, the ChopBox is completely waterproof (but not dishwasher-safe) so you can wash and scrub to your heart’s content without worry.

According to the company, a single one-hour charge will give you 30 days of battery life, and can be recharged through a Micro USB port.

The ChopBox reached its \$10,000 Kickstarter goal just 10 minutes after launching its campaign, but you can still contribute at different tiers. Once it’s officially released, the ChopBox will retail for \$200, but you can get one for \$100-\$120 if you pledge fast. You can back the ChopBox here.

Mental Floss has affiliate relationships with certain retailers and may receive a small percentage of any sale. But we choose all products independently and only get commission on items you buy and don't return, so we're only happy if you're happy. Thanks for helping us pay the bills!

# McDonald’s Is Testing Out Plastic-Free Restaurants in Germany and Canada

Tim Boyle/Getty Images

The public pressure on corporations to adopt sustainable practices grows stronger by the day, but there’s no manual on how exactly they should do it. To give itself some room to experiment before committing to a global roll-out, McDonald’s is testing out plastic-free restaurants in Germany and Canada.

Food & Wine reports that the first location to go green was a McDonald’s in Germany’s Mall of Berlin, which the burger behemoth dubbed the Better McDonald’s Store for 10 days in June. While some changes were pretty standard—paper straws and wooden cutlery replaced their plastic counterparts, for example—others demonstrated a commendable level of creativity. Condiments came in edible waffle cups, and burgers were served in wrapping made from actual grass.

According to a press release, the Berlin trial was a way of allowing customers and stakeholders to contribute to the discussion and provide feedback so McDonald’s could adjust its large-scale game plan accordingly.

“Normally, McDonald’s goes out with perfect solutions,” Diana Wicht, the sustainability department head for McDonald’s Germany, explained in the press release. “This time we said ‘We don’t have perfect solutions yet … Please help us!”

McDonald's

Unsurprisingly, customers did have some thoughts. The grass packaging was a straightforward success, and the waffle cups had a fair number of fans, too—though some felt the shape of the cups could be better optimized for dipping McNuggets. Straws presented more of a conundrum, because most people acknowledge that while plastic straws are evil, paper straws disintegrate too quickly to be a workable solution; some customers suggested completely eliminating straws for patrons dining in the restaurant simply by serving lid-less drinks. Wooden cutlery, however, was a flop; one of every two customers surveyed said it tasted “woody.”

Overall, McDonald’s deemed the experiment a success, and has opened two comparable stores in Ontario and British Columbia to gauge Canadian customers' responses.

The fast-food giant has also sprinkled smaller sustainability changes in other stores around the globe. McDonald’s Canada swapped out its napkins for smaller ones manufactured from recycled fibers, and McDonald’s UK is in the process of ditching plastic McFlurry lids and replacing plastic salad containers with recyclable cardboard versions.

Hopefully, the McDonald’s sustainability overhaul will also lead to the invention of a McFlurry machine that doesn’t break down so often.

[h/t Food & Wine]

arrow
LIVE SMARTER
arrow
LIVE SMARTER