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

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What makes some contact lenses able to be used for a year, and others last for only months or a day?

614 upvotes

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How likely are type 2 civilizations to develop?

1 upvotes

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Because a species is defined as a group of organisms that can successfully reproduce with themselves producing offspring which can also reproduce, would an individual who is infertile be considered not part of the species?

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Is it possible to build a ramp so large in which one could conceivably walk off the planet and into space?

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Is it possible for humans to single handedly destroy the entire universe?

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If I am standing one meter away from a mirror, how fast would I have to turn around in order to see the back of my head?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
What makes some contact lenses able to be used for a year, and others last for only months or a day?	614
How likely are type 2 civilizations to develop?	1
Because a species is defined as a group of organisms that can successfully reproduce with themselves producing offspring which can also reproduce, would an individual who is infertile be considered not part of the species?	1
Is it possible to build a ramp so large in which one could conceivably walk off the planet and into space?	1
Is it possible for humans to single handedly destroy the entire universe?	1
If I am standing one meter away from a mirror, how fast would I have to turn around in order to see the back of my head?	1