AQA core science
Fractional distillation is the separation process of a chemical mixture into its component parts, or fractions, such as in separating chemical compounds by their boiling point by heating them to a temperature at which several fractions of the compound will evaporate. Fractional distillation is used in the separation of different gases in their liquid state. In this process, the air is cooled to a very low temperature, turning it into a liquid.
10 Scientific Images That Changed How We Looked at the World - Popular Mechanics -- Cosmic Background Radiation(Date: 1964) Discovered by accident in 1963, Cosmic Microwave Background Radiation is essentially noise left over from creation of the universe. Dating back to just 380,000 years after the big bang, the CMB is a baby picture of our universe, and finding it was a triumph of cosmology.