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
Martin Luther King, Jr.
Dr. Martin Luther King, Jr.’s birthday is in January. We … read more
In the Know
April Showers
In many states April means Spring. Flowers appear. Birds build … read more
In the Know
Why Can You See Your Breath When It’s Cold Outside?
Brrr! It’s getting cold outside. Some days, you might be … read more