Recent comments in /f/askscience

WhalesVirginia t1_j42o906 wrote

> Uhm, the thing about science is that the only way to improve on the science is more science.

The way to improve is not just more science. It's better science. Something like 80% of papers are never read after publishing, a surprisingly large number of papers are retracted. We have a quality problem, not a quantity.

>An opinion or pointing out a possible flaw doesn't advance science, but may be a part of future science that advances things further.

Being critical of models advances science. It shows where a model fails. My issue is with the politicization rising up science because it fits a narrative. There's plenty of great climate science, but there is plenty of kind iffy stuff that hits front page reddit on the daily.

> But if you don't have a solid grasp on the science done so far, then you're just having opinions that are unlikely to make much of an impact or be considered unless you have substantial credentials in the field.

Well obviously.

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perta1234 t1_j42meit wrote

Yes and no. It is bit complicated. Some disorders are combinations of variants of different genes, so there it is not the cause. Some are caused by dominant gene variants, so there as well, relatedness does not play a role. But then there are the recessive disorders, where you must inherit similar bad variant from mother and father, so there relatedness does matter.

Close relatedness of parents increases the proportion of genes, where the child has two identical variants. If some proportion of the genes are coding recessive disorders, one is more likely have an disorder. It is the mutation or the genotype that causes the disorder. Relatedness has impact on the genotype. So relatedness can have an indirect impact, but that depends on the existence of those mutations or gene variants.

Most disorders are of the recessive type or something that was beneficial in a different environment.

We are all "somehow related".

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cailien t1_j42lxcq wrote

This is unfortunately caused by the pop-science presentations of the uncertainty principle. To answer this fully, two different pieces have to be teased apart, and precision in language becomes important. There is a general confusion of two different phenomena. The uncertainty principle and the observer effect.

Observer Effect A phenomenon where measuring a system requires interacting with that system and changes the observables of that system.

The uncertainty principle Given an experiment where we can set the initial position of a particle to be at (0x, 0y, 0z, 0t) with a momentum p and we later measure the position and momentum of that particle a time t later, if we repeat that experiment for many particles, we will get a range of different final positions and momenta. The uncertainty principle holds that the product of the standard deviations of the distributions of final position and momenta, given a definite starting position and momentum, cannot be less than some limit. If one knows a particle's position and momentum now, one cannot predict both what its future position and momentum will be.

These two ideas (the uncertainty principle and the observer effect) are completely unrelated. Just because when a system is measured, it has to be interacted with does not mean that interaction is unpredictable. We can, in principle, fully account for all interactions and know how the measurement will affect the system and back out information about the system pre-interaction.

The uncertainty principle is orthogonal to measurement, and is related to what is possibly knowable about a system given full, perfect information. We can know perfectly where a particle is now, and what its momentum is now, and that will not allow us to accurately predict what its position and momentum is in the future.

The uncertainty principle is epistomological, it is a principle about what is fundamentally knowable. We can know everything there is to know about a system, we can fully specify its wavefunction and know how it will evolve forever and still not be able to predict the values of all observables about the system in the future. Knowledge of the future position of a particle is fundamentally incompatible with knowledge of its future momentum. Joint knowledge of future position and momentum are guaranteed to always be fuzzy with some spread in either or both observables.

There are often things reported about measurements "beyond the Heisenberg limit" which are breathlessly reported on, saying that they "broke the uncertainty limits" or whatever. Those are related to incorrect statements about the uncertainty principle and that it applies to any one measurement at all. To be clear, the uncertainty principle does not restrict what one can measure about a particle. You can perfectly measure a particle's position and momentum at any given time. The thing that the uncertainty principle forbids is using that information to know, with certainty, the future position and momentum of the particle.

> But as far as I'm concerned that is not a natural law but a restriction caused by our own inability to observe those data points without influencing the system ourselves.

To be very clear, it is a natural law that is not premised on experimental failures to observe things nor is it caused by our inability to observe without influencing. In mathematical models where all information about a system is known precisely, and all measurements are perfect, the results are the same. Future position and momentum cannot be known with joint precision below a certain limit.

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h3rbi74 t1_j42ka84 wrote

True, a horse for example has a resting HR in the 20s-40s and for most domestic species, the smaller they are the faster they go, and vice versa. I have never heard that a giraffe can go 500 bpm and I can’t find a zoo reference manual on a quick search but several sources claim a normal HR for a giraffe is 150-170 bpm, which is insanely fast for something that huge. A relaxed house cat is frequently less than that.

Here is one source for giraffe HR that also has some cool BP info. https://iheart.polimi.it/en/the-incredible-cardio-circulatory-system-of-giraffes-a-challenge-to-gravity/

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ScienceIsSexy420 t1_j42hpbb wrote

Mutations cause genetic disorders, but inbreeding increases the chances of inheriting those mutations. That's why you see things like the prevelance of Tay-Sachs in the Ashkenazi Jew population. Humans are especially vulnerable to inheriting genetic disorders due to inbreeding because of a lack of genetic diversity caused by previous population bottlenecks during prehistoric times.

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bitofrock t1_j42etdr wrote

Uhm, the thing about science is that the only way to improve on the science is more science.

An opinion or pointing out a possible flaw doesn't advance science, but may be a part of future science that advances things further.

But if you don't have a solid grasp on the science done so far, then you're just having opinions that are unlikely to make much of an impact or be considered unless you have substantial credentials in the field.

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tbiko t1_j42emtg wrote

"Dead air" or dead space is the volume of air that fills the space from your mouth/nose to the small airways of your lung that exchange oxygen and carbon dioxide. An above average height man may breath about 600 ml per breath and have about 200 ml be dead space. So only 400 ml air available for exchange. If he closed his nose and put is mouth around a large straw that held 600 ml of volume, he'd have to increase his breathing depth (and frequency) compensate, and would get pretty tired.

The OP likely just learned about dead space ventilation and the giraffe is a logical follow up question.

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