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 February 16, 2014, it was announced that Gravity Falls would move from Disney Channel to Disney XD in Spring 2014, and that the second season would be shown on that channel. On March 4, 2014, Alex Hirsch announced on his Twitter account that the second season would premiere in Summer 2014.