YAMAHA explains a diamond needle is used to cut 'a continuous spiral groove into an aluminum disc covered in lacquer'. "This groove, which runs from the outside of the disc to the inside, is an analog ...

Evidence suggests continuous learning is a resolution you'll want to keep. Harvard Business Review suggests that skills-based hiring is increasingly important to corporate recruitment strategies.

Why it's so special: This image of a spiral galaxy taken by the Hubble Space Telescope is a portrait more than two decades in the making. Like most full-color images of space objects, it's a ...