IF YOU thought the Higgs boson was elusive, consider the case of dark matter. The Higgs—the particle that gives other subatomic species mass—was predicted in 1964 but actually nabbed only last year.

In this video, Fran Scott explains fractional distillation - the separation of crude oil into fractions. Crude oil is a finite resource; petrol and other fuels are produced from it using fractional ...

During the fractional distillation of crude oil: ...

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