invention of cellphones
Do you know who invented cell phones? 1873: British physicist James Clerk Maxwell (1831–1879) published the theory of electromagnetism, explaining how how electricity can make magnetism and vice-versa. Read more about his work in our main article on magnetism . 1876: Scottish-born inventor Alexander Graham Bell (1847–1922) developed the first telephone while living in the United States (though there is some dispute about whether he was actually the original inventor). Later, Bell developed something called a "photophone" that would send and receive phone calls using light beams. Since it was conceived as a wireless phone, it was really a distant ancestor of the modern mobile phone. 1888: German physicist Heinrich Hertz (1857–1894) made the first electromagnetic radio waves in his lab. 1894: British physicist Sir Oliver Lodge (1851–1940) sent the first message using radio waves in Oxford, England. 1899: Italian inventor...