The definitions of four SI base units – the kilogram, ampere, kelvin and mole – have been changed. The new definitions are based on fixed numerical values of the Planck constant (h), the elementary charge (e), the Boltzmann constant (k) and the Avogadro constant (NA) respectively. They came into force on 20th May. The seven… Read more Revised SI units
The Royal Institution Christmas Lectures are popular science talks given around Christmas each year. The first one was in 1825. They were started by the scientist Michael Faraday. They have been televised since 1936. You can watch the more recent lectures online: for example, Carl Sagan’s six lectures on the planets (1977) and last year’s… Read more Royal Institution Christmas Lectures
physics.org is a guide to physics on the web, published by the Institute of Physics in Britain. You can search its database of 4,000 physics websites or do some experiments, like the one pictured. There is also information about courses and careers.