When Was the Toothbrush Invented?
The toothbrush like the one we use today was invented in 1938 but the Chinese invented something similar in 1498 and were bristles taken from a hog's neck.
Nine ways to master this topic
Sometimes you simply need a fresh perspective to solve a challenge. Click here
for a random insight from history's great thinkers.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.