Note the lowercase c. So Calories and kilocalories are pretty much the same thing. Kilocalories. It's easy to get confused about calories and kilocalories since, in a nutrition context, values are actually given for the number of kilocalories in a food, but referred to simply as calories. 1000 calories= 1 Kcal. Nutrition.gov
Video: Leonin and Perotin: Musical Contributions, Polyphony & Ars Antiqua. The development of polyphonic, or multi-part music, was a fundamental part of the late Medieval period, and it forever influenced music thereafter. In this lesson, learn about how polyphony developed through the Medieval church composers Leonin and Perotin. Music 101: Help and Review / Humanities Courses.
Perrelet is considered the father of the automatic watch. He introduced the concept in 1770 and was way ahead of his time since the invention was better suited to wristwatches. Perrelet lived in the pocket watch era and, because the watches did not move much in pockets, the rotor system did not perform so well.