While calorie counts vary with pizza toppings and recipes, a slice of cheese pizza (weighing about 103 grams) is around 272 calories, according to LiveStrong.com. A calorie counting website averaged a slice of cheese pizza at nearly 250 calories. Indulge wisely and check out these eight pizza deals for Pi Day. Read: The Best Pi Day Jokes. Villa Italian Kitchen: Customers can get a Neapolitan cheese pizza for $3.14 with a coupon.
The Navy's nuclear-powered submarines can stay submerged for long periods of time. Air is isn't a problem as their make their own oxygen and keep the air clean. The limits on how long they can stay underwater are food and supplies. Submarines generally stock a 90-day supply of food, so they can spend three months underwater. The diesel-powered submarines (not now used by the Navy) had a limit of several days submerged.
U.S. nuclear-powered submarines can go faster than 23 miles per hour, which is 37 kilometers per hour or 20 knots (nautical miles per hour) underwater. The shape of the tear drop hull design allows a submarine to slice cleanly through the ocean when there is water on all sides.