Firefighters, police officers, ambulance drivers, garbage collectors, mail carriers, crossing guards public-school teachers, school-grounds and maintenance workers, public librarians, bus drivers, and parks and recreation workers are just a few of the city-service people that make a town or city run well. Every day, these and hundreds of other workers labor to make communities across the United States safe, clean, and healthy. Many of these workers are paid for their jobs, but many also volunteer (work without pay) to help their neighborhoods be safe. The government estimates that about 60 million people volunteer each year, most often in religious, educational, youth, or community service organizations. Volunteers commonly perform activities such as firefighting, coaching, campaigning, fundraising, delivering goods, and serving on boards or neighborhood associations.
- What is head lice?
- What do I do if witness bullying on the playground?
- Should I tell my parents I am being bullied?
- What are antibiotics?
- What causes people to pass gas?
- How does an electric car work?
- What were some of the earliest steam and gasoline driven vehicles?
- Who invented the automobile?
- How does a cable car stop and go?
- How does an escalator work?
- Why are they called skyscrapers?
- How do elevators work?
- What is the tallest building in the world?
- How is steel used in skyscrapers?
- What is the Nobel Prize?
- Why are there different religions and how did they spread?
- What was the Industrial Revolution?
- What is a patent?
- What is the difference between an invention and a discovery?
- Which state was once an independent kingdom?


