Noise-canceling headphones generate sound waves that destructively interfere with incoming noise.

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

More photos are taken every two minutes today than were taken in the entire 1800s.

The internet connected computers across the world.

The cotton gin increased cotton processing efficiency.

The first website ever created is still online at info.cern.ch.

The first emoji was created in 1999 by Japanese designer Shigetaka Kurita for a mobile internet platform.

The wheel is one of the earliest human inventions.

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