I don’t know about you, but I look back rather nostalgically on the practical exams that I took as an 18 year old as part of my A-levels in physics and chemistry. At the time, I wasn’t looking forward ...

Speaker one Minus 273 degrees Celsius is the lowest possible temperature. It’s called absolute zero. Any object with a temperature above this will emit and absorb infrared radiation, even the Earth.

THIRTY years ago Prof. E. C. Pickering published his “Physical Manipulation.” The whole aim of the book, he told his readers, was to show how work in the physical laboratory might be made to teach a ...