The FBI's CODIS database contains DNA profiles from over 20 million people.

The radio enabled wireless communication over long distances.

The '@' symbol was chosen for email addresses because it was the least-used character on keyboards at the time.

Moore's Law observed that transistor density on chips doubles approximately every two years — this held for roughly 50 years.

The Burj Khalifa is the tallest building in the world.

The average Google search uses about 0.3 watt-hours of electricity.

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

There are classified inventions that have never been revealed publicly.

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