The term that describes the optical trick of swelling columns at midpoint, which was used in the design of the Parthenon is entasis. If you take a look at the ancient Greek columns, you will see that they are a bit wider in the middle - so the column is not completely straight, but rather swells up in the middle so as to "correct the visual illusion of concavity." It was often used by artists in the ancient Greek times.
Researchers estimate that 32 million Americans have food allergies, including 5.6 million children under age 18. That's one in 13 children, or roughly two in every classroom. About 40 percent of children with food allergies are allergic to more than one food.
