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MATTHEW DADDARIO & PASHA PELLOSIE DELIVERY MAN (2013)
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When a piece of paper is set on fire with a match, the atoms (mostly carbon, hydrogen, and oxygen) in the chemical compounds in the paper combine with the molecules of oxygen in the atmosphere to produce the chemical compounds carbon dioxide and water and to release heat and light. This is a chemical reaction that we call combustion.
The sun is carrying out a much different process called nuclear fusion. Each second the sun converts 700,000,000 tons of the element hydrogen into 695,000,000 tons of the element helium. This releases energy in the form of gamma rays. The gamma rays are mostly converted to light eventually. This process does not require oxygen. It does require incredibly high temperatures and pressures.

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THE BOY AND THE HERON (2023) 君たちはどう生きるか | dir. Hayao Miyazaki
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