/u/T_Lawliet's posts in /r/askscience

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About Newton’s third law... if I push a toy car and an equal and opposite reaction is exerted on my hand as I do so by the point of application of the force, wouldn’t the two forces cancel each other out and the car would remain in equilibrium?

12 upvotes

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Why do humans only create their own vitamin D?

9 upvotes

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What is the accepted explanation for the Mpemba effect?

1 upvotes

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If the flow of electrons through a circuit is from the negative to the positive terminal, why is the electric current considered to be flowing from the positive to the negative?

1 upvotes

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Is it physically possible for you to use a Batman or Just Cause style grapnel gun?

1 upvotes

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I once watched a movie where one person was directly behind another and a pistol was shot right in front of them, going through both of their skulls. I don't think this is possible in real life but if it is, what type of gun would I have to use?

1 upvotes

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If suddenly all mosquitoes go extinct how would that effect the world’s ecosystem?

1 upvotes

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What system uses the smallest amount of external energy possible to keep itself running?

1 upvotes

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Why does the human body bother to create vitamin D directly from sunlight when you can get it from food as well? Why is Vitamin D the only one that can be made by the body itself?

1 upvotes

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Why do humans only create their own vitamin D?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
About Newton’s third law... if I push a toy car and an equal and opposite reaction is exerted on my hand as I do so by the point of application of the force, wouldn’t the two forces cancel each other out and the car would remain in equilibrium?	12
Why do humans only create their own vitamin D?	9
What is the accepted explanation for the Mpemba effect?	1
If the flow of electrons through a circuit is from the negative to the positive terminal, why is the electric current considered to be flowing from the positive to the negative?	1
Is it physically possible for you to use a Batman or Just Cause style grapnel gun?	1
I once watched a movie where one person was directly behind another and a pistol was shot right in front of them, going through both of their skulls. I don't think this is possible in real life but if it is, what type of gun would I have to use?	1
If suddenly all mosquitoes go extinct how would that effect the world’s ecosystem?	1
What system uses the smallest amount of external energy possible to keep itself running?	1
Why does the human body bother to create vitamin D directly from sunlight when you can get it from food as well? Why is Vitamin D the only one that can be made by the body itself?	1
Why do humans only create their own vitamin D?	1