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