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

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Can a 3D printer print a 3D printer?

464 upvotes

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Are there known "evolutionary valleys?" Suboptimal traits that, once evolved, remain for long periods of time because, despite being suboptimal, selection pressure still pushes deviations back towards the trait?

458 upvotes

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Why is my beard hair different than my head hair?

457 upvotes

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Is the gravitational force the only force that distorts space-time and if so, why is that ?

457 upvotes

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Has science now come to the certainty of 100% that an asteroid or meteor colliding with Earth was the cause of the dinosaur extinction?

456 upvotes

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A question from someone who probably has no clue what he's talking about: why can't I as an animal be classified into a sub-species and/or breed based on the unique physical traits shared by myself and my genetic relatives, like other species?

456 upvotes

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Was there ever a time in the history of the earth where if an intelligent civilization had arisen and self-destructed, we would now see no evidence in the fossil record?

453 upvotes

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What exactly is happening to a cat while it's under the influence of Catnip?

450 upvotes

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Why does psychology not study the effects of religion on the mind?

449 upvotes

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Is there a speed a cell phone can go to not receive wifi or cell signal anymore?

438 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Can a 3D printer print a 3D printer?	464
Are there known "evolutionary valleys?" Suboptimal traits that, once evolved, remain for long periods of time because, despite being suboptimal, selection pressure still pushes deviations back towards the trait?	458
Why is my beard hair different than my head hair?	457
Is the gravitational force the only force that distorts space-time and if so, why is that ?	457
Has science now come to the certainty of 100% that an asteroid or meteor colliding with Earth was the cause of the dinosaur extinction?	456
A question from someone who probably has no clue what he's talking about: why can't I as an animal be classified into a sub-species and/or breed based on the unique physical traits shared by myself and my genetic relatives, like other species?	456
Was there ever a time in the history of the earth where if an intelligent civilization had arisen and self-destructed, we would now see no evidence in the fossil record?	453
What exactly is happening to a cat while it's under the influence of Catnip?	450
Why does psychology not study the effects of religion on the mind?	449
Is there a speed a cell phone can go to not receive wifi or cell signal anymore?	438