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
Spending Time with the Elderly
Someone is elderly if they are old or aging. Sometimes … read more
In the Know
A New Gate in Central Park
Central Park is a beautiful park. It is in New … read more
In the Know
What Are Tariffs?
Have you heard of tariffs? A tariff is money added … read more