Inventors and inventions

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Across
  1. 1. Magnets don't usually___________ to glass.
  2. 5. ____________ is used to stick two things together.
  3. 6. We use _____________ to measure temperature.
  4. 8. Percy Spencer was doing ___________ the radar when he came up with the idea of the microwave oven.
Down
  1. 2. Wilhelm Roentgen ___________ the X-ray.
  2. 3. Tomato ketchup __________ a lot of sugar.
  3. 4. ____________ is made up of very small, dry pieces of something.
  4. 7. If you__________ oil and water, the oil floats on top.