The Lab and the Fan: teacher key

Ghosts, grade 6 edition, written for 6th grade. How did a scientist find the cause of eerie feelings in a lab? Follow the clues, from a fan to a stage.

Read the book. Print this page for the key.

Questions and answers

1. What did Vic Tandy trace eerie feelings in a lab to?
   • A hidden actor
   • A hill on Mars
   • A faulty extractor fan (answer)
2. What is infrasound?
   • A pop from a duct
   • Sound with a pitch below 20 hertz (answer)
   • A reflection in glass
3. What did scientists in England and Scotland ask visitors to do?
   • Walk around and mark where they felt anything unusual (answer)
   • Draw faces in clouds
   • Count the creaks in a house
4. Why do some floors make more noise in cold weather?
   • Warm air shrinks the glass
   • Fog falls on the boards
   • Winter air dries wood out, so the boards shrink (answer)
5. What does the story of the Mars hill suggest about photos?
   • A photo always shows a face
   • A sharper photo can correct a first impression (answer)
   • Photos cannot show hills

Words

• infrasound: very low sound
• pareidolia: seeing faces
• reflection: mirrored picture
• ducts: air tubes