John Oliver Visits the Large Hadron Collider

Some think it will destroy the world, while other don't. ;) See also Wikipedia: Safety of particle collisions at the Large Hadron Collider
Definitions: Hadron: Any of a class of subatomic particles that are composed of quarks and take part in the strong interaction.
Quark: Any of a group of six elementary particles having electric charges of a magnitude one-third or two-thirds that of the electron.

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There are two schools of thought about the Large Hadron Collider (LHC), the worlds largest particle accelerator in Geneva.