Many different types of energy can be converted into heat energy. Light, electrical, mechanical, chemical, nuclear, sound and thermal energy itself can each cause a substance to heat up by increasing the speed of its molecules. So, put energy into a system and it heats up, take energy away and it cools.
Alexander Alex Robert Hirsch (born June 18, 1985) is the creator and former executive producer of the American animated television series, Gravity Falls. He voiced two of the main characters, Grunkle Stan and Soos. He also voiced supporting and recurring characters such as: Old Man McGucket, Bill Cipher, the gnomes and many others.
Dipper I can very much relate to, like most, I think him having the reality part of him and his sister are great. mable is the imaginative part of them. 2 Mabel Pines Mabel Pines is one of the lead characters of the Disney XD animated series Gravity Falls. The character is voiced by Kristen Schaal, and designed by the series creator, Alex Hirsch. She is inspired by Hirsch's own twin sister, Ariel Hirsch.