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how can you tell if aliens are trying to contact earth?

the clue
I'm Joseph. My friend Anthony and I listened for alien signals with a short wave radio. But there were way too many places on the dial for us to monitor. Plus, when Anthony used the TV remote, it made a funny noise on the radio. It took awhile for us to figure out where that noise was coming from. It's hard to tell if a signal is from an alien, or is just radio interference.
whiz quiz
How large is the average meteor?

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