The theremin is one of the only instruments played without being touched.

Steel was a rare luxury material in the ancient world — mass production became possible only in the 19th century.

The concept of a touchscreen dates to 1965; the first commercially successful touchscreen phone was the iPhone in 2007.

The steam engine powered early industrial machinery.

The printing of paper currency simplified trade.

The GPS system provides global positioning information.

QWERTY keyboard layout was designed in 1873 partly to separate commonly used letter pairs and reduce mechanical jamming.

The total amount of data created in the last two years exceeds all data created in previous human history.

The Shanghai Maglev train reaches extremely high speeds.