The repeal of the Missouri Compromise was more impactful, according to historian Robert Forbes, than the compromise itself. While it effectively settled the question of slavery from 1820 to 1854, its repeal began the sectarian conflict that eventually brought the nation into the Civil War. Vocabulary.
The first popcorn machine was invented by Charles Cretors of Chicago, Illinois in 1885. In order to test his machine, it was necessary for Charles to operate it on the street as the customer.
The microwaves from the radar set he was working on were cooking the candy bar in his pocket! With a little experimentation, Spencer figured out that the microwaves could be concentrated to heat food. He created the first working microwave oven, and the first food he cooked in it was popcorn. Microwave ovens use microwaves, which are radio waves at a frequency of approximately 2,500 megahertz, to heat food. Microwaves are absorbed by water, fats and sugars and are immediately converted to heat. The microwaves penetrate food quickly, so they cook food evenly and quickly.