Q: Which of these will best separate iron filings from sand?

OPTIONS:
- water
- a magnifying glass
- a magnet
- rubbing alcohol
A: a magnet
Q: Where is the first place a scientist should present new research data about the structure of a galaxy in order to receive the most appropriate review of the research?

OPTIONS:
- a high school science classroom
- a university science blog
- a peer-reviewed science journal
- a popular science news magazine
A: a peer-reviewed science journal
Q: Which scientist is best known for studying plants and animals?

OPTIONS:
- Isaac Newton
- Albert Einstein
- Charles Darwin
- Nicolaus Copernicus
A: Charles Darwin
Q: What keeps Mars in orbit around the Sun?

OPTIONS:
- friction
- gravity
- magnetism
- solar power
A:
gravity