Came across this interesting piece of news on Rediff today! Hari Why popcorn doesn't pop! April 19, 2005 Ever wondered why, in a bag of popcorn bought at the movies, there are always some unpopped kernels at the bottom? Well, a Purdue University team led by food chemist Bruce Hamaker of the Whistler Centre of Carbohydrate Research has the answer. "It is a matter of scientific curiosity and we are in the food business, so we decided to find out," Purdue's Rengaswami Chandrasekaran said. After analysing 14 varieties of corn popped in a microwave oven, the team discovered that the key pop-ability factor is the kernel's cellulose hull, known as the pericarp. Chandrasekaran, a crystallographer, found that the pericarp in corn that popped has a stronger crystalline structure than the pericarp in those that didn't. "With a better organised crystal structure," he said, "the kernel retains moisture better. It swells as it heats up until it finally explod...