A laser is a thin beam of light. People use lasers all the time. You may have a laser at home. A DVD player uses a laser to read a DVD. A cashier uses a laser to read bar codes.
Photo Credit: ktsdesign/Shutterstock
In the Know
Skyscraper Month
Skyscraper Day is in September. Why is a tall building … read more
In the Know
Why Do Basketballs Bounce?
Have you ever played basketball? It’s fun to play with … read more
In the Know
Kids Have Great Ideas, Too!
An inventor is someone who has great ideas. You might … read more