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...central positively charged nucleus surrounded by negatively charged electrons. The nucleus comprises positively charged protons and neutrons carrying no charge. The masses of protons and neutrons are the same, but the mass of electrons is negligible in comparison. The number of protons must equal the number of electrons, where there is an imbalance the species are...

...central to modern public health in the twenty-first century, but the methods of data collection now involve global monitoring and surveillance networks and huge online databases...Public Health Approaches to Infectious Disease: 2.2 Public health surveillance and response in a globalised world - The rise of holidays abroad, cheap air travel, and the mass population...

...central heating, set the coordinates for your satellite navigation system, change from an overhead lamp to a wall light, or even just change station on your television, you are applying a routine solution to a problem by reconfiguring the bits. As I write, I'm reminded of the ongoing attempt by a group of stalwarts to reconfigure the standard keyboard, originally designed...