Click on a number in the grid to see the clue or clues for that number. Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter.

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 Check 

1. Fiber optics are covered with ___________ 3. This device was invented by Alexander Graham Bell in 1876. 4. George Eastman created this camera. 6. The kind of paper you write your speech on. 9. This object orbits Earth and tranmits radiowaves. 11. This was the first name of the boy who invented Braille. 13. A type of telephone that allows more freedom is called a _______ free model. 17. A network that links billions of computer together. 18. A _______ replaces words, phrases, or messages to form a secret message. 19. The person who approves bugs and taps. 20. The kind of bird they used to carry mail. 21. In 1859, they thought of a new way to send mail in the US using horses. It was the _______ _______.

1. A ____________ translates every single letter, number, or symbol with a different letter, number, or symbol 2. It means "far sound" in Greek. 5. What do walkie -talkies use to communicate? 7. A long sound on the telegraph is called a "Dah", a short sound is a _____ 8. A cellphone relies on ________ 9. What is the universal gesture? A ________ 10. The last name of the man who inspired Alexander Graham Bell. 12. The number of years American Sign Language had to exist underground. 13. The Chauvet cave had a whole wall of drawings of these body parts. 14. Another word for secret agents. 15. A machine developed by the Germans in WWII to send coded messages. 16. The last name of the man who invented the radio.