May 21, 2025
The modern toothbrush came into use about 1938 following the invention of nylon. Previously, toothbrush bristles were made with animal hair.
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10 Inventions That Changed Your World
You may think you can’t live without your tablet computer and your cordless electric drill, but what about the inventions that came before them? Humans have been innovating since the dawn of time to get us to where we are today. Here are just 10 of the hundreds of inventions that profoundly changed
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May 20
What country is the hair transplant capital of the world? -
May 19
Why is there a 352-foot-tall doric column on the banks of Lake Erie? -
May 18
What routine medical procedure has put the vice president in charge several times? -
May 17
How much money do astronauts earn while stuck in space? -
May 16
How many times does an average person swallow each day? -
May 15
How do cans of diet and regular soda react differently in water? -
May 14
Which mountain is the most climbed? -
May 13
How are porcupines used to decorate clothing? -
May 12
What monthly occurrence is always a holiday in Sri Lanka? -
May 11
How frequently is a baby born in the U.S.?