On Wednesday, April 20, Treasury Secretary Jacob J. Lew announced that Harriet Tubman will replace Andrew Jackson, the seventh President of the United States, on the $20 bill. T...

Japan is famous for its state-of-the-art high-speed railway system. In 2015, its Magnetic Levitation or, Maglev train, which gets its name because it hovers 10 cm above the trac...