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

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How do deciduous trees know that it’s actually autumn and not just an extended cold snap in April or May and start changing color and dropping leaves?

1013 upvotes

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We are able to catch the common cold year after year so does that mean that the viruses (rhinovirus and—to a lesser extent—Coronaviruses) mutate fast enough that we don’t ever develop full immunity to them analogous to influenza? If so, why isn’t the common cold much more severe?

7 upvotes

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Would our birth control pills (obviously with the dose adjusted) work for most other mammals? What about non-mammalian animals?

1 upvotes

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How long have earth’s oceans been salty?

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We just found 7000 stars we never detected before within JUST 300 light years of us. Given that, how do we KNOW that we have accurately determined the amount of normal matter in the universe?? Could some of the mass we tag as dark matter just be stars too faint to see?

1 upvotes

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Why does bacteria grow so well in water as opposed to other solvents?

1 upvotes

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If vomiting is the body’s way of trying to expel a toxin from the stomach, why do we tend to get so violently nauseated during a hangover the next day when the alcohol has long left our stomach?

1 upvotes

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Why don’t the very first kernels of popcorn that pop not burn while they are sitting there for 2 to 3 minutes in the microwave already popped?

1 upvotes

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Why is it that when you take amphetamine (Adderall, Desoxyn, Vyvance, etc.) you not only have the energy but the DESIRE and focus to clean the whole house or finish a big project? Is it really just dopamine driving all of that?

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Why do some breads toast up (and burn) much faster than others?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How do deciduous trees know that it’s actually autumn and not just an extended cold snap in April or May and start changing color and dropping leaves?	1013
We are able to catch the common cold year after year so does that mean that the viruses (rhinovirus and—to a lesser extent—Coronaviruses) mutate fast enough that we don’t ever develop full immunity to them analogous to influenza? If so, why isn’t the common cold much more severe?	7
Would our birth control pills (obviously with the dose adjusted) work for most other mammals? What about non-mammalian animals?	1
How long have earth’s oceans been salty?	1
We just found 7000 stars we never detected before within JUST 300 light years of us. Given that, how do we KNOW that we have accurately determined the amount of normal matter in the universe?? Could some of the mass we tag as dark matter just be stars too faint to see?	1
Why does bacteria grow so well in water as opposed to other solvents?	1
If vomiting is the body’s way of trying to expel a toxin from the stomach, why do we tend to get so violently nauseated during a hangover the next day when the alcohol has long left our stomach?	1
Why don’t the very first kernels of popcorn that pop not burn while they are sitting there for 2 to 3 minutes in the microwave already popped?	1
Why is it that when you take amphetamine (Adderall, Desoxyn, Vyvance, etc.) you not only have the energy but the DESIRE and focus to clean the whole house or finish a big project? Is it really just dopamine driving all of that?	1
Why do some breads toast up (and burn) much faster than others?	1