/u/[deleted]'s posts in /r/askscience

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If you were traveling straight up, similar to a space shuttle launch, at a steady rate off 100MPh and you threw a ball straight down at 50MPh, would the ball continue to rise?

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Is it possible on earth to have a liquid that is lighter than air, and floats? If not is it possible anywhere?

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What's considered to be "normal" weight fluctuation for a healthy person, based on water/food intake and other factors?

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What force pushes a photon to the "speed of light"?

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Why is laughing a natural reaction to funny things?

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If I had two perfectly smooth pieces of some element, say gold, would they create any molecular level bonds when placed together?

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How volatile are propane tanks?

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Does alcohol produced through different processes affect the human body and mind differently?

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A guy in a class of mine had this idea to solve the world's energy crisis. Help me determine fact from fiction.

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How can a parrot imitate human language and why can't other species do so?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If you were traveling straight up, similar to a space shuttle launch, at a steady rate off 100MPh and you threw a ball straight down at 50MPh, would the ball continue to rise?	12
Is it possible on earth to have a liquid that is lighter than air, and floats? If not is it possible anywhere?	12
What's considered to be "normal" weight fluctuation for a healthy person, based on water/food intake and other factors?	12
What force pushes a photon to the "speed of light"?	12
Why is laughing a natural reaction to funny things?	12
If I had two perfectly smooth pieces of some element, say gold, would they create any molecular level bonds when placed together?	12
How volatile are propane tanks?	12
Does alcohol produced through different processes affect the human body and mind differently?	12
A guy in a class of mine had this idea to solve the world's energy crisis. Help me determine fact from fiction.	12
How can a parrot imitate human language and why can't other species do so?	12