The first computer bug was an actual insect — a moth found in a Harvard Mark II computer in 1947.

More than 90% of the world's currency exists only digitally — not as physical cash.

The Pentagon has plans prepared for zombie outbreaks as training scenarios.

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

The Akashi Kaikyō Bridge in Japan is one of the longest suspension bridges.

There are classified inventions that have never been revealed publicly.

The harmonica, also known as a mouth organ, was invented in Germany in the early 19th century.

The steam locomotive expanded rail travel.

The smartphone combines communication, computing, and media functions.