Magnetic Storage. Piano wire, an electromagnet and a microphone. This was all the Danish inventor Valdemar Poulsen (1869-1942) needed in 1898 to create the telegraphone or wire recorder â the first known device capable of recording sound magnetically.agnetic Storage. Piano wire, an electromagnet and a microphone. This was all the Danish inventor Valdemar Poulsen (1869-1942) needed in 1898 to create the telegraphone or wire recorder â the first known device capable of recording sound magnetically.
And as of 2016, there are about 2.3 million home-schooled students in the United States (Brian, 2016). The studies found that of these children, 83 percent were White, 5 percent were Black, 7 percent were Hispanic, and 2 percent were Asian or Pacific Islander.
Homeschooling in the United States constitutes the education for about 3.4% of U.S. students (around 2 million students).n the U.S., homeschooling is lawful in all 50 states. The U.S. Supreme Court has never ruled on homeschooling specifically, but in Wisconsin v. Yoder, 406 U.S. 205 (1972) it supported the rights of Amish parents to keep their children out of public schools for religious reasons.