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.
On July 29, 2013, Disney announced that it had renewed Gravity Falls for a second season. On February 15 and 16, 2014, Disney Channel announced that Gravity Falls would move to Disney XD along with Wander Over Yonder but will still air episodes on Disney Channel as part of Disney XD on Disney Channel.