when do we find out garnet is a fusion
Garnet (Steven Universe) The first time viewers see Garnet's "fusion" become undone is in the episode "The Return", the succeeding episode "Jail Break" marking the first appearance of the two Gems that make up Garnet: Ruby and Sapphire. Her design also changed in that episode. According to Sugar, Garnet was intended to be a fusion since the pilot episode, though the characters of Ruby and Sapphire came into focus while Sugar was writing for Garnet. Sugar described the process as "reverse engineering" the two personalities based on what the production team brought to the show.[7] Garnet being a fusion of two Gems was a popular fan theory before it was revealed to be true in "Jail Break", as the writers included minor hints in various episodes. Neither character was given real depth in "Jail Break", but their presence explain how Garnet's two parts blend into one character. Ruby is characterized as feisty and aggressive, while Sapphire is stoic and contemplative, resulting in a complex dynamic when Garnet is fused together. Garnet's stable relationship while fused is used as a metaphor in the series, as Ruby and Sapphire together are stronger than any one Gem on their own.[3]
Fusion power Fusion processes require fuel and a highly confined environment with a high temperature and pressure, to create a plasma in which fusion can occur. In stars, the most common fuel is hydrogen, and gravity creates the high temperature and confinement needed for fusion. Fusion reactors generally use hydrogen isotopes such as deuterium and tritium, which react more easily, and create a confined plasma of millions of degrees using inertial methods (laser) or magnetic methods (tokamak and similar), although many other concepts have been attempted. The major challenges in realising fusion power are to engineer a system that can confine the plasma long enough at high enough temperature and density, for a long term reaction to occur, and for the most common reactions, managing neutrons that are released during the reaction, which over time can degrade many common materials used within the reaction chamber.