Recent comments in /f/askscience
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Reply to comment by Lashb1ade in How old is the ISS REALLY? by gwplayer1
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Mcdiglingdunker t1_jad3tis wrote
Reply to comment by beef-o-lipso in How do ancient cities get buried under more modern ones? by inexister
Seattle moved the whole city one floor higher because the toilets flooded back up with the incoming tide. Apparently, the first camps and some building had the water at their back door as they were on the tidal plain. Cool tour, highly recommend!
[deleted] t1_jad1wex wrote
Reply to comment by beef-o-lipso in How do ancient cities get buried under more modern ones? by inexister
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[deleted] t1_jad0uyh wrote
Reply to comment by viridiformica in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
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[deleted] t1_jaczcbm wrote
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[deleted] t1_jacyeqp wrote
Reply to comment by insink2300 in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
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Centoaph t1_jacy5fa wrote
Reply to comment by platoprime in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
It’s unlikely to get heads on your next 10 coin flips. You’re almost guaranteed to get 10 heads in a row if you flip coins all week though.
tayman12 t1_jacx4x5 wrote
Reply to comment by hananobira in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
alright, considering i know nothing about these animals or biology i am gonna call that a win
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the__itis t1_jactczc wrote
Reply to comment by fletch44 in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
It would seem to me that current climate conditions at the time of birth would change survivability rates dynamically.
Higher survivability rates should equate to a higher ratio of females as they would subsequently reproduce the overall population in higher numbers.
I believe mammals (Great apes specifically) have a similar “quirk” where older male age and higher average calorie diets lead to more female births.
[deleted] t1_jacqa22 wrote
Reply to comment by JMKPOhio in How do ancient cities get buried under more modern ones? by inexister
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JMKPOhio t1_jacplal wrote
Reply to comment by Allfunandgaymes in How do ancient cities get buried under more modern ones? by inexister
By extension, does this mean that we might be able to uncover, for example, an Ancient Greek papyri cache with many of our lost plays and poems?
demansj t1_jacor2v wrote
Terraforming events such as earthquakes, volcanos, floods, asteroids etc. We’re talking big things here, events capable of erasing all traces of human life, and burying it deep under rubble, which soon becomes part of earth itself.
AMartin223 t1_jaco2pt wrote
Reply to comment by viridiformica in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
I think the main reason for that mindset is that we have these various documented syndromes like described above where failures to emit certain hormones prevent the transition to male anatomy, so it feels more like the female path is the default rather than a different fork in the road. It seems though that describing the early stages either way can be a correct model.
hananobira t1_jacni22 wrote
Reply to comment by tayman12 in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
Other way around. Mothers are more likely to have daughters when the food supply is low. Females are hardier, are more resistant to famine and disease, and live longer. Mothers are more likely to have sons when they are living in plenty, because sons are less likely to survive childhood and require greater resources to grow taller and stronger.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2602810/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3367790/
https://www.sciencedaily.com/releases/2011/09/110927192352.htm
Delirivms t1_jacmxfa wrote
Reply to comment by ke_marshall in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
So the band 'ZZ top' derives its meaning from homosexual birds?
[deleted] t1_jacmnai wrote
paroya t1_jacm0kh wrote
Reply to comment by Gravemonera in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
certain swordtail population can do a female to male change later in their life.
medaka (oryzias latipes) have about a 100% male exclusive hatch rate at 34°, starting from 27° and going up from there.
on topic of swordtails, there is a related species (amazon molly) which is unique in that it is the only known stable all-female species, reason so far unknown afaik.
in case anyone wanted to google papers.
kmoonster t1_jaclwiu wrote
You know how a sidewalk, driveway, etc will get grass and trees in the cracks that you have to clip? And how the edge of the grass can creep over the edge of the concrete, meaning the sidewalk occasionally has to be edged to keep it clear? Same thing, but with a lot more time.
Worth adding that cultures would often knock down old buildings and just level the remnants, then put the replacement building right on top of the older one just a foot or two higher than the predecessor. Many of these are the big mounds you see that are listed as archeological sites.
Combine these two for generation upon generation, and you end up with ruins buried anywhere from a few centimeters up to several meters under what we now call ground-level.
Of course, wind and water can move dirt in -- and they can remove or erode it as well.
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nadiaco t1_jack3ct wrote
Reply to comment by Ieatadapoopoo in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
well alligators are very very old and haven't changed much over a very very long time so it must be working pretty well as an advantage for survival.
insink2300 OP t1_jacjsft wrote
Reply to comment by lazercheesecake in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
Totally forgot about human fetuses starting as female. I’ve always questioned though, just because they’re not male yet, what exactly makes them female?
Yaver_Mbizi t1_jad4hsn wrote
Reply to comment by hananobira in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
Does it work the same way for reptiles, though?