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
Health Emergency
This man works for the Centers for Disease Control (CDC). … read more
In the Know
Sea Caves in Two Seasons
Look at this sea cave. It is on Lake Superior. … read more
In the Know
Making an IMPACT: Sophie Cruz
Have you ever given a speech? Were you nervous? Excited? … read more