Inventor of sound recording technologies: Ray Dolby

Inventor of sound recording technologies: Ray Dolby

The name Dolby is no stranger to many of us. Some of us know this name from the Dolby Digital or Dolby Surround logos we see before the movies. Some of us, on the other hand, remember it from the text on the key used to reduce the "hiss" sound on cassette players.

Do You Know Who Really Invented the Wheelbarrow? Zhuge Liang

Do You Know Who Really Invented the Wheelbarrow? Zhuge Liang

Wheelbarrow, It was invented by the Chinese minister Zhuge Liang, who lived during the Han Dynasty between 181-234. He used Liang's wheelbarrow to carry supplies to wounded soldiers. But because it was an important invention, it was used secretly without seeing the enemy.