/u/dla26's posts in /r/askscience

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If 2 objects are traveling at 0.5 the speed of light relative to some 3rd object but in opposite directions, would each perceive the other as going the speed of light? What about 0.6 times to speed of light?

10093 upvotes

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What happens to the potential energy of an object that's lifted past the point of Earth's gravitational pull?

2 upvotes

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Did some research but still confused: Is fluoride, both in toothpaste and the water supply, harmful?

1 upvotes

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Why does my dishwasher manual say that I should not pre-rinse dishes first?

1 upvotes

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Recommendations for books about gender identity?

1 upvotes

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What is the evolutionary advantage to some animals of producing venom so potent that it can kill other creatures much larger than their normal prey 100x over?

1 upvotes

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Why aren't cans made to minimize the metal used (height = diameter)?

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How likely is it to get covid from someone who's been vaccinated?

1 upvotes

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I was asked to lead an activity during my daughter's new jr. high school camping trip. Any ideas on a 1-hour activity that will blow the kids' minds with science?

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What are smells made of?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If 2 objects are traveling at 0.5 the speed of light relative to some 3rd object but in opposite directions, would each perceive the other as going the speed of light? What about 0.6 times to speed of light?	10093
What happens to the potential energy of an object that's lifted past the point of Earth's gravitational pull?	2
Did some research but still confused: Is fluoride, both in toothpaste and the water supply, harmful?	1
Why does my dishwasher manual say that I should not pre-rinse dishes first?	1
Recommendations for books about gender identity?	1
What is the evolutionary advantage to some animals of producing venom so potent that it can kill other creatures much larger than their normal prey 100x over?	1
Why aren't cans made to minimize the metal used (height = diameter)?	1
How likely is it to get covid from someone who's been vaccinated?	1
I was asked to lead an activity during my daughter's new jr. high school camping trip. Any ideas on a 1-hour activity that will blow the kids' minds with science?	1
What are smells made of?	1