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.
WASHINGTON  Americans are more educated than ever before, with a greater percentage graduating from high school and college than a decade ago, U.S. Census data released Tuesday show. Eighty percent of Americans are graduates of high school or higher, compared with 75.2% in 1990, the 2000 figures show.That change came about in part because of a decline in the rate of students dropping out before ninth grade: 7.5% in 2000, compared with 10.4% in 1990.1  Take a look at the numbers.ighty percent of Americans are graduates of high school or higher, compared with 75.2% in 1990, the 2000 figures show. That change came about in part because of a decline in the rate of students dropping out before ninth grade: 7.5% in 2000, compared with 10.4% in 1990. 1  Take a look at the numbers.