Across
- 3. a small machine or tool that is useful
- 5. a test that helps scientists answer their questions
- 8. sometimes but not very often
Down
- 1. something new that someone thinks up and creates
- 2. a place where scientists work and do experiments
- 4. a very smart person
- 6. a sound, a movement, or another sign that sends a message
- 7. run by electricity