the most important invention

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Across
  1. 1. you can use it from your homework and for a gameing.
  2. 3. Every line hits at power, yet reveals nothing outright.
  3. 4. you can do anything everywhere whit it even another countery.
  4. 5. it hides things on the face
  5. 8. it can vanish fast. (you can use it ).
  6. 9. it hides danger in light.
  7. 10. We need to get it from our phones to work.
Down
  1. 2. it hides cold secrets.
  2. 6. it hides messages.
  3. 7. something moves behind the screen.