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

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I was always told that if you did LSD even once, traces of it would stay in your body forever. Is this even remotely true?

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Are Kurzweil's postulations on A.I. and technological development (singularity, law of accelerating returns, trans-humanism) pseudo-science or have they any kind of grounding in real science?

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If I covered my roof with reflective aluminium foil, would it lower my cooling expenses?

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Why do women have a hymen?

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If our skin cells die and regenerate so much, as well as most of the other cells in our body, why are tattoos still visible after so many decades?

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If temperature trends show ~.1C/decade warming, won't we run out of fossil fuels before reaching 2C warming?

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If certain flying insects are strongly, sometimes insanely, attracted to bright light... What keeps them from flying at the sun?

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Is Flouride actually bad for you or not?

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Why do big cats (lions, tigers, etc.) have round pupils, but small cats have slit pupils?

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Why did obesity rates skyrocket only recently in the past 30 years, and not gradually throughout the 20th century?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
I was always told that if you did LSD even once, traces of it would stay in your body forever. Is this even remotely true?	99
Are Kurzweil's postulations on A.I. and technological development (singularity, law of accelerating returns, trans-humanism) pseudo-science or have they any kind of grounding in real science?	99
If I covered my roof with reflective aluminium foil, would it lower my cooling expenses?	99
Why do women have a hymen?	99
If our skin cells die and regenerate so much, as well as most of the other cells in our body, why are tattoos still visible after so many decades?	99
If temperature trends show ~.1C/decade warming, won't we run out of fossil fuels before reaching 2C warming?	99
If certain flying insects are strongly, sometimes insanely, attracted to bright light... What keeps them from flying at the sun?	98
Is Flouride actually bad for you or not?	98
Why do big cats (lions, tigers, etc.) have round pupils, but small cats have slit pupils?	98
Why did obesity rates skyrocket only recently in the past 30 years, and not gradually throughout the 20th century?	98