1) what if we touch Mercury solid
2) what is coldest country in the world?
3) what is the Universe made of?
4) are we alone in the universe?
5) why do we dream?
I mark you brilliant later if you answer this question
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5) during REM (rapid eye movement) sleep
1) It's never safe to touch mercury
3) normal matter, 'dark matter' and 'dark energy'
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