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.
Fiddleford Hadron Old Man McGucket (voiced by Alex Hirsch) â The local kook of Gravity Falls, and former friend of Stanford. Bill Cipher (voiced by Alex Hirsch) â A powerful dream demon from another plane of existence that can influence or control citizens of Gravity Falls through a trans-dimensional mindscape.