Do humans gain and lose personality traits? If so, how often, and what kind of events would prompt this?

Do humans gain and lose personality traits? If so, how often, and what kind of events would prompt this?
If humans did not burn fossil fuels and return some CO2 into the atmosphere, would the Earth reach a point of collapse where plants would not have any carbon to build with?
Why doesn’t a pot of boiling water evaporate instantly?
Is there any prime number that is greater in value than double the previous prime?
Do rivers always flow downwards (in the same direction of the gravity)?
How do short takeoff/landing planes work?
Why does the cell membrane of human cells do not get dissolved with ethanol?
Will my vaccine trial be used for other vaccines?
Can comets and asteroids have cave systems?
What exactly makes a substance carcinogenic?
Are there documented effect of mothers taking mental health medicine during pregnancy?
In a Cu-Zn, H2SO4 battery, why do the electrons pushed off the Zn by SO4- not flow directly into the liquid phase to contact the H2+? Why do they flow through the wire to the Cu into the liquid phase instead?
Is seawater antiseptic? If not, at what salt/ mineral content is a liquid antiseptic,antiviral, etc?

Posted: 02 Aug 2020 10:43 AM PDT

submitted by /u/Legobrick1000
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If humans did not burn fossil fuels and return some CO2 into the atmosphere, would the Earth reach a point of collapse where plants would not have any carbon to build with?

Posted: 03 Aug 2020 12:20 AM PDT

So I saw a video a while ago that went into details about how the Earth has been losing carbon in its atmosphere for some time now. As a result plants began to grow slower and smaller to sustain themselves. In recent years as a result of human activity it had been found that crops were growing quicker now due to the elevated levels of CO2 in the Atmosphere giving a greater abundance of building materials. Though, as a result to accelerated growth, vegetables were less nutritious.

My question I guess is around what would happen if humans never burned fossil fuels and returned some of that Carbon into the atmosphere. Would we reach the point where plants would no longer be able to sustain themselves as they do now? Would fossil fuels just renew and trap more and more carbon out of the ecosystem and cause it to collapse at some point?

submitted by /u/Dootduteeedo
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Why doesn’t a pot of boiling water evaporate instantly?

Posted: 02 Aug 2020 10:56 PM PDT

When you have a pot of boiling water on the stove at 100c (the boiling point of water), the water appears to only slowly evaporate. If the boiling point is defined as the temperature that liquids turn to gases, why doesn't it happen instantly? How can I have 100c liquid water at sea level, doesn't that mean the boiling point is higher in some instances?

Thanks for any helpful replies. This has bugged me for awhile.

submitted by /u/OneRisk1
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Is there any prime number that is greater in value than double the previous prime?

Posted: 02 Aug 2020 04:12 PM PDT

Or rephrased: Is there any pair of consecutive primes whose separation is greater than the smaller of the pair?

submitted by /u/LjSpike
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Do rivers always flow downwards (in the same direction of the gravity)?

Posted: 03 Aug 2020 04:22 AM PDT

submitted by /u/benzdabezben
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How do short takeoff/landing planes work?

Posted: 02 Aug 2020 07:16 AM PDT

I'm really curious about the science behind planes that can take off and land with literally 6 feet of runway? Why do other planes need hundreds of yards/meters to take off where these planes can do it in like 6 feet/ 2 meters?

submitted by /u/Tots795
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Why does the cell membrane of human cells do not get dissolved with ethanol?

Posted: 02 Aug 2020 06:57 AM PDT

The other day I read a post were it was explained that ethanol is used to sterilize because it can dissolve viruses' and bacteria's lipidic membrane and denaturalize their proteins.

So why when we put alcohol in a wound don't our cells get killed by the same mechanism that works for bacteria and viruses?

submitted by /u/joalcuadrado
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Will my vaccine trial be used for other vaccines?

Posted: 02 Aug 2020 07:56 AM PDT

I'm taking part in a Covid vaccine trial that used proteins instead of dead virus. Can this be used later for ther vaccines?

submitted by /u/We_Are_Chaos_555
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Can comets and asteroids have cave systems?

Posted: 02 Aug 2020 03:15 AM PDT

submitted by /u/TheSentinelsSorrow
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What exactly makes a substance carcinogenic?

Posted: 02 Aug 2020 07:18 AM PDT

submitted by /u/Gijshaha3
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Are there documented effect of mothers taking mental health medicine during pregnancy?

Posted: 02 Aug 2020 03:08 AM PDT

submitted by /u/Nekomiminya
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In a Cu-Zn, H2SO4 battery, why do the electrons pushed off the Zn by SO4- not flow directly into the liquid phase to contact the H2+? Why do they flow through the wire to the Cu into the liquid phase instead?

Posted: 02 Aug 2020 07:29 AM PDT

Follow up question: Why does Zinc prefer to exist as ZnSO4 instead of Zn. Aren't both neutrally charged? Are the two electrons making the Zn neutral covalent in nature?

submitted by /u/Gulrix
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Is seawater antiseptic? If not, at what salt/ mineral content is a liquid antiseptic,antiviral, etc?

Posted: 02 Aug 2020 12:23 AM PDT

submitted by /u/ABreckenridge
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