Recent comments in /f/askscience

UnamedStreamNumber9 t1_jdfhm2t wrote

Reply to comment by CrustalTrudger in Does the metal in the solid core of a rocky planet have any special properties? by VillagerNo4

Not questioning anything you’ve said here but am trying to reconcile your statement about minimal uranium in the core with high school level popular science attributing heat in the earth’s interior being due to, in part, the heat of radioactive decay. If the majority of radioactive elements have migrated to the crust through <geologic process terms I don’t understand>, what is decaying inside the earth (and where) to generate that 50% internal heating from radioactive decay

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dragracesssss t1_jdfadc9 wrote

Reply to Where do rumen bacteria come from? by ryum1503

They get it as they exit the birth canal and from suckling the mom's Teats during feeding. Some of it survives the stomach initially and then the good bacteria spread through the rest of the GI tract.

it also works the same way in humans, and there's a theory that giving our children beneficial bacteria is why we just wanna kiss them up so much.

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privateTortoise t1_jdf7dkp wrote

Reply to comment by IPv6Guy in Does the metal in the solid core of a rocky planet have any special properties? by VillagerNo4

It's stuff like this that had me plowing through books as a child and couldn't leave a set of encyclopedias alone.

Has meant on many occasions I haven't a clue where/how or why I know something but when scrutinised has turned out to be correct. Just wish I could recall the wisdom and knowledge from my memory when its under duress.

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wwjgd27 t1_jdewitu wrote

Reply to comment by CrustalTrudger in Does the metal in the solid core of a rocky planet have any special properties? by VillagerNo4

Just a minor addition that pressure has a minor effect on the thermodynamic state function when compared to temperature so the crystal phase of the inner core shouldn’t be much different than that of what we see at the surface. We need to start talking about neutron star densities to see a pronounced effect!

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kazarnowicz t1_jdev4a9 wrote

Reply to comment by h3rbi74 in Where do rumen bacteria come from? by ryum1503

It's a most fascinating topic. The relationship between us and our gut bacteria affects mood, personality, health … the so far single most fascinating fact about the gut biome is that we've learned that the vagus nerve carries an overwhelming amount of information to the brain, rather than from the brain down.

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virusofthemind t1_jdeunx3 wrote

Reply to What’s the oldest know tortoise with a documented hatching date? by The_Real_Mr_F

Charles Darwin visited the Galapagos in 1835 and the giant tortoises were one of the many unusual species which greeted him of which he collected several specimens to return to England for further study. One of those tortoises, Harriet, went on to become the oldest recorded Galápagos tortoise – she finally succumbed to a heart attack in 2006 at the ripe old age of 175, surviving Darwin by well over a century.

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h3rbi74 t1_jdeqa5e wrote

Reply to Where do rumen bacteria come from? by ryum1503

Calves become exposed to their mother’s gut flora during birth and while nursing in the first few days after birth. One source:

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0220554

Then the population will gradually adapt as the baby moves from milk to grazing, but rumens aren’t unique— this process happens (and must happen!) in every animal. We all have massive intricate communities of micro-organisms inside us and all over us! And they’re usually easily acquired from our environment and our families, because the world isn’t sterile. And they all undergo adaptation and adjustment if we change our diet or other variables in our living situation.

Try a search for the keyword “microbiome” to go down a rabbit-hole of information in whichever species you are interested in!

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