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.
Alex Hirsch. Alexander Robert Alex Hirsch (born June 18, 1985) is an American animator, storyboard artist, voice actor, and television producer. He is best known as the creator of the Disney XD animated television series Gravity Falls, where he voices some of the characters. He has previously worked as a storyboard artist on the Cartoon Network series The Marvelous Misadventures of Flapjack and the Disney Channel series Fish Hooks.