Today, most answering machines are digital, and use the same technology as a CD or MP3 player. Learn more about digital answering machines in this HowStuffWorks podcast.
BrainStuff
2,611 clip(s)
What Happens When Your Immune System Turns on You?
How Can Slime Mold Think Without a Brain?
What's the Difference Between Cougars, Pumas, and Mountain Lions?