In 1820, Hans Christian Ørsted found that an electric current produces a magnetic field as it flows through a wire. In the 1830s, American scientist Joseph Henry wound wire around iron cores to make ...

George Whitefield: From School Dropout to Open-Air Evangelist Hudson Taylor: Fit to Serve, Missionary to China C. S. Lewis: An Adventure in Faith Dietrich Bonhoeffer: The Cost of Discipleship Jim ...