Recent comments in /f/askscience
[deleted] t1_jadg8by wrote
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[deleted] t1_jadfmki wrote
Reply to How do neurons stay connected? by Jmatt133
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saywherefore t1_jadf9gk wrote
Reply to How do measurement uncertainties propagate through calculations in an experiment? by slackslackliner
The easiest way to see the effect of uncertainties in a calculation is to redo the sums with the extreme values of the range.
So let’s say your average value was 20cm^3 per 10 seconds. The limits are:
20 - 1 = 19cm^3 per 10 seconds = 19 x 6 = 114 cm^3 per minute
20 + 1 = 21cm^3 per 10 seconds etc
This also helps to see how uncertainties combine, by considering all the limits that affect the final result in the same direction, although as another commenter alluded to, you don’t necessarily need to combine all your uncertainties linearly.
PHealthy OP t1_jadeqow wrote
Reply to comment by AndrewFurg in Are we past the tipping point for the insect population decline? by PHealthy
Do you have any references or is this just a lay opinion? From what I've seen, not my field, it would seem fairly dire.
varialectio t1_jadehk0 wrote
Reply to How do measurement uncertainties propagate through calculations in an experiment? by slackslackliner
1 - Yes. The relative uncertainty must stay the same so X ± 1 per 10 seconds is the same as X * 6 ± 6 per minute.
2 - Averaging multiple results reduces the error by a factor of 1/✓n. Root 5 is a little over 2 so averaging five measurements would roughly halve the uncertainty.
[deleted] t1_jadcmmy wrote
[deleted] t1_jadbxgt wrote
Reply to How do neurons stay connected? by Jmatt133
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mfb- t1_jadbv3t wrote
> lepton flavor is conserved
It's not. And you found out why not.
If you try to apply this to e.g. a muon to electron+photon decay you get absurdly small branching fractions (10^(-50) or so, theorists don't bother calculating it more precisely because it's zero for all practical purposes).
atred t1_jadb4np wrote
Reply to comment by platoprime in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
Did I say that you implied that? Geez.
platoprime t1_jadam8r wrote
Reply to comment by Centoaph in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
Did I say it couldn't happen and forgot about it?
[deleted] t1_jadaipd wrote
Reply to comment by redhousebythebog in How do ancient cities get buried under more modern ones? by inexister
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platoprime t1_jada7qj wrote
Reply to comment by atred in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
Did I say it couldn't happen somewhere? If it could not evolution would not work. What a strange interpretation.
AndrewFurg t1_jad9mp9 wrote
Not likely. Insects as a group are exceptionally diverse and most reproduce quickly with large numbers of offspring. It will vary strongly from group to group, with heat-loving generalists doing well and specialists (e.g. obligate parasites with rare hosts) hurting the most.
Additionally, some are very susceptible to pollution, while others can survive nearly anywhere (e.g. mosquitoes in shallow, ephemeral pools).
-Metacelsus- t1_jad9fo4 wrote
Reply to comment by insink2300 in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
>Totally forgot about human fetuses starting as female.
This isn't actually correct, it's more like they start off as undifferentiated, and trigger male or female development depending on whether the SRY gene is present.
-Metacelsus- t1_jad961c wrote
Reply to comment by lazercheesecake in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
> The gonads themselves react to the environment temperature epigenetically. This is the theory that is the biggest departure from the others as it doesn't specifically target a separate messenger hormone (even though one may or may not be present).
This has been proven pretty well, at least in one species of turtle: https://pubmed.ncbi.nlm.nih.gov/29748283/
But other species might be different.
Also, you write, "in humans, all babies start off development as females." But this isn't correct. A better way to say it would be that they start off as undifferentiated, and trigger male or female development depending on whether the SRY gene is present.
[deleted] t1_jad8xop wrote
Reply to comment by turtley_different in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
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Ieatadapoopoo t1_jad8nlf wrote
Reply to comment by Nvenom8 in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
Yes, very true, thanks!
Gederix t1_jad8j6z wrote
Reply to Can spiders walk backwards? by MightyKin
Species that use vision to hunt like wolf or jumping spiders do have vision behind them, and yes spiders can walk backwards, trapdoor spiders do this every time they drag a still struggling victim into their lair never to be seen again.
SumgaisPens t1_jad7pev wrote
Reply to comment by JMKPOhio in How do ancient cities get buried under more modern ones? by inexister
We might recover more, but it’s much less likely that paper and other organic materials survive in areas of high moisture, like wetlands or aquifers, unless they are low oxygen environments, like bogs.
[deleted] t1_jad7l3d wrote
Reply to Is creativity and IQ linked? by YepJustAnAccount
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ElJamoquio t1_jad7kdm wrote
Reply to comment by 2legittoquit in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
How many other methods of evolution were randomly used?
[deleted] t1_jad7eck wrote
Alex_877 t1_jad7aag wrote
Reply to Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
All of current life on earth is mediated through reactions by enzymes. Each enzyme has a most active temperature region based on its specific protein structure, length and folding etc.
In this case the difference in temperature is enough to produce a cascade of effects to make the enzymes responsible produce a difference in the offspring.
crazynerd9 t1_jad78p1 wrote
Reply to comment by JMKPOhio in How do ancient cities get buried under more modern ones? by inexister
Yes and this sort of thing does happen, however it grows more and more unlikely as we find and excavate what remains of sites that could hold such relics.
[deleted] t1_jadgqqe wrote
Reply to [Light/Optics] What is the Irradiance range of human vision? by DeismAccountant
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