Will a transplanted body part keep its original DNA or slowly change to the hosts DNA as cells die and are replaced?

Will a transplanted body part keep its original DNA or slowly change to the hosts DNA as cells die and are replaced?
why is my body still able to feel the motion of waves after having left the beach?
Are there Chaotic Systems in the human body?
How do animals evolve the ability to do really weird stuff, like make cocoons and metamorphasize into a butterfly?
There is so much concrete and asphalt used to create roads, since it absorbs so much heat does it contribute to global warming as it releases that heat at night when it cools off outside?
Why does the camera inside the Vera C. Rubin telescope (LSST) need a 1.5m lens if the three-mirror telescope already focuses the light?
How fast does the human eye shift position, say looking from left to right, in one movement?
Does the risk of breakthrough covid-19 infection (symtomatic or otherwise) appear to vary based upon age?
Why is sweat salty? Why not sweet? (That is, why is sweat made, in part, of salt?)
How does climate change affect carbon dating?

Posted: 14 Jul 2021 04:26 PM PDT

I've read that all the cells in your body die and are replaced over a fairly short time span.

If you have and organ transplant, will that organ always have the donors DNA because the donor heart cells, create more donor heart cells which create more donor heart cells?

Or will other systems in your body working with the organ 'infect' it with your DNA somehow?

submitted by /u/mrDecency
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why is my body still able to feel the motion of waves after having left the beach?

Posted: 14 Jul 2021 10:59 PM PDT

this mostly occurs right before i am about to fall asleep.

submitted by /u/Solaris_c
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Are there Chaotic Systems in the human body?

Posted: 14 Jul 2021 01:06 PM PDT

Does the body contain any systems that are unpredictable due to minute changes in the initial conditions?

I was wondering whether there are unpredictable systems in the body akin to weather or planetary orbit that over longer periods of time become unpredictable due to tiny differences in the initial conditions, down to quantum fluctuatins.

submitted by /u/runningshoes1
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How do animals evolve the ability to do really weird stuff, like make cocoons and metamorphasize into a butterfly?

Posted: 14 Jul 2021 10:38 AM PDT

I get the fundamental "mutations and survival of the fittest" thing. And that makes sense for something like a giraffe. You get a longer neck b/c the incremental mutations are useful, so in the long run you get a string of mutations that basically amount to "Let's do more of that long-neck thing!"

But how do you get the really weird stuff? Like, what's the incremental step towards a caterpillar turning into a butterfly? If it spins a cocoon and doesn't turn into a butterfly, it's just wasted energy. And how do you turn into a butterfly without a cocoon? Because my understanding is that the caterpillar doesn't just grow wings inside of there. It liquifies back into biomass goo, and it fully re-constitutes itself as a different thing (wild!). But how do you... "sort of halfway" do that?

Or like, how do you evolve something like alternation of generations? That also seems... just weird. And not something you can really do halfway.

How do these biological mechanisms evolve, and do we have current examples of something undergoing some evolution to something super bizarre? Is there some animal out there where we can predict "Hey in 2 million years, this thing could well have tendrils that have light emitters to laser designate hunting targets for long-range thorn artillery" or something?

submitted by /u/Ethan-Wakefield
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There is so much concrete and asphalt used to create roads, since it absorbs so much heat does it contribute to global warming as it releases that heat at night when it cools off outside?

Posted: 14 Jul 2021 07:48 PM PDT

submitted by /u/nirnova04
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Why does the camera inside the Vera C. Rubin telescope (LSST) need a 1.5m lens if the three-mirror telescope already focuses the light?

Posted: 15 Jul 2021 04:16 AM PDT

This telescope made recent-ish news on account of containing the largest camera ever built, including a massive optical lens that took several years to construct.

This confuses me. I was under the impression that the parabolic mirrors inside telescopes already act as a camera lens, focusing light down to a point. So couldn't you simply mount the CCD inside the focal plane of the telescope? Why is there an extra, expensive, massively overengineered camera lens in the design? What fundamental purpose is it serving?

submitted by /u/haas_n
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How fast does the human eye shift position, say looking from left to right, in one movement?

Posted: 14 Jul 2021 11:23 AM PDT

I had to ask here since google is useless to answering this question.

submitted by /u/ToxicRabbit443
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Does the risk of breakthrough covid-19 infection (symtomatic or otherwise) appear to vary based upon age?

Posted: 14 Jul 2021 10:17 AM PDT

In other words, is there any research indicating that older individuals are more at risk for breakthrough infections from the delta varient even after partial/complete vaccination?

submitted by /u/wiredwalking
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Why is sweat salty? Why not sweet? (That is, why is sweat made, in part, of salt?)

Posted: 13 Jul 2021 08:49 PM PDT

submitted by /u/Twofingersthreerocks
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How does climate change affect carbon dating?

Posted: 13 Jul 2021 06:41 PM PDT

(I'm not sure if I used the correct flair)

submitted by /u/the_sinking_stone
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