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April is the best time to visit London when the temperatures are mild and the city's parks are green and blooming. Samuel Johnson once said: “ By seeing London, I have seen as much of life as the world can show. ” London is a major global centre of higher education teaching and research and has the largest concentration of higher education institutes in Europe. More than 250 years ago, Michael Faraday conducted his research on the magnetic field around a conductor carrying a direct current, which established the basis for the concept of the electromagnetic field, the cornerstone for technologies related to antennas and propagation.