Recent comments in /f/science
[deleted] t1_j7codgi wrote
Reply to New review finds that rocket emissions in the upper atmosphere can affect the ozone layer but are not regulated — Global annual launches grew from 90 to 190 in the past 5 years, and an upsurge in rocket launches may potentially undo decades of work to save the ozone layer by marketrent
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korinth86 t1_j7cn4tx wrote
Reply to comment by DNTOP in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
I mean Vitamin D is already known to help depression... This isn't new information really.
korinth86 t1_j7cn1yi wrote
Reply to comment by rosaUpodne in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
Vitamin D is already used to treat depression and low energy.
Many people spend all day in an office, car, or their home. Lack of sunlight is kind of a modern problem.
Taking a supplement is unlikely to harm you, but if you're concerned consult your doctor.
New_Revenue_4_U t1_j7cmf5v wrote
Reply to comment by Larein in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
Sorry, didn't mean to forget you guys!
InsularAtlantica t1_j7cme0m wrote
Reply to Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
Anecdote of one - but ever since I first heard that Vitamin D may help prevent and/or reduce COVID symptoms (the research is mixed) I have been taking Vit D and my mood has been better.
(I've also added morning walks, as well, because that's also been shown to help sleep - thus mood - and reduce COVID risk)
[deleted] t1_j7cmbbl wrote
Reply to comment by Snoo-11861 in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
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pingasthrowaway t1_j7cm107 wrote
Reply to comment by W3remaid in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
Vitamin D is one of the few supplements a lot of scientists believe the daily value should be higher than the amount we set.
Fyren-1131 t1_j7cl810 wrote
Reply to comment by Solid-Brother-1439 in An anti-aging gene discovered in a population of centenarians less prone to cardiovascular complications, has been shown to rewind the heart's biological age by 10 year by giuliomagnifico
i tried to find courage for therapy for years. in my third session my therapist gave up and now i dont really know if that did more damage than good.
SirSquatsAlot27 t1_j7ckwum wrote
Reply to comment by enirgin in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
It’s population biased
WeylandsWings t1_j7ck4sy wrote
Reply to comment by marketrent in New review finds that rocket emissions in the upper atmosphere can affect the ozone layer but are not regulated — Global annual launches grew from 90 to 190 in the past 5 years, and an upsurge in rocket launches may potentially undo decades of work to save the ozone layer by marketrent
> A new fuel is methane, which is used in multiple rocket engines under development by major launch companies. The emissions products of methane are as yet poorly understood.
????? What? The combustion byproducts of a methalox rocket is mostly H2O and CO2.
And it isn’t poorly characterized. The report authors just don’t look into it. NASA has a wonderful piece of software/web site that you can run Computational Chemical Equilibrium simulations, even simulated rocket engines. And it is pretty accurate.
And for a 300 bar , sea level methalox engine it spits out the following mass fractions of various species at the Comustion Chamber, the throat, and most importantly for this discussion the Exit. (Forgive the formatting, on mobile)
Species. Chamber Throat Exit
*CO 0.22048 0.20984 0.13790
*CO2 0.27689 0.29368 0.40681
COOH 0.00009 0.00005 0.00000
*H 0.00071 0.00060 0.00001
HCO 0.00004 0.00002 0.00000
HO2 0.00028 0.00016 0.00000
*H2 0.00681 0.00644 0.00695
HCOOH 0.00002 0.00001 0.00000
H2O 0.41879 0.42748 0.44829
H2O2 0.00008 0.00004 0.00000
*O 0.00481 0.00356 0.00000
*OH 0.04585 0.03779 0.00005
*O2 0.02515 0.02032 0.00000
So as you can see, the vast majority of the exhaust is Water, Carbon Dioxide, and Carbon Monoxide. Now there will be other trace components because the system assumes the LOX and Methane are totally pure, but even then those will be trace.
[deleted] t1_j7cju3l wrote
Reply to New review finds that rocket emissions in the upper atmosphere can affect the ozone layer but are not regulated — Global annual launches grew from 90 to 190 in the past 5 years, and an upsurge in rocket launches may potentially undo decades of work to save the ozone layer by marketrent
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Igotz80HDnImWinning t1_j7cjesz wrote
Reply to comment by enirgin in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
The VA ships it to your house. Also, this goes beyond a simple effect to show 1. A dose-dependent improvement (argues more strongly for a necessary or sufficient effect) and 2. A physiological model supporting their hypothesis because darker skinned folks have less vit D from the same amount of sun, and it had a larger effect in black veterans. I don’t love epidemiology, but this is far better than your average retrospective study and clearly points for a large randomized trial to be done to confirm.
EquilibriumBoosted t1_j7cjeh5 wrote
Reply to comment by Veasna1 in Study shows that regular coffee drinking (2 to 3 cups per day) is associated with lower systolic blood pressure (SBP), peripheral pulse pressure (PP), aortic BP and aortic PP, but with similar arterial stiffness by giuliomagnifico
cortisol is raised in any stress induced activity , even exercise. ashwaghanda and ginseng may help lower cortisol
EquilibriumBoosted t1_j7citwd wrote
Reply to Study shows that regular coffee drinking (2 to 3 cups per day) is associated with lower systolic blood pressure (SBP), peripheral pulse pressure (PP), aortic BP and aortic PP, but with similar arterial stiffness by giuliomagnifico
coffee seems to enhance exercise and also mimick some health effects from exercise.
[deleted] t1_j7cim4c wrote
Kek_Lord22 t1_j7cic07 wrote
GrowsOnGraves t1_j7ci2ac wrote
Reply to comment by [deleted] in An anti-aging gene discovered in a population of centenarians less prone to cardiovascular complications, has been shown to rewind the heart's biological age by 10 year by giuliomagnifico
In my husband's family no man has made it to 60 (in at least 3 gens as far as I know) because of heart issues. My father in law was still body building at 55 and had a heart attack. 70 isn't so bad
[deleted] t1_j7ci1fw wrote
Kek_Lord22 t1_j7chxr6 wrote
Reply to comment by [deleted] in An anti-aging gene discovered in a population of centenarians less prone to cardiovascular complications, has been shown to rewind the heart's biological age by 10 year by giuliomagnifico
Everyones different, you're just wrong
MagicPistol t1_j7chwij wrote
Reply to comment by Snoo-11861 in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
Cool thanks. Think I'll pick up some vitamin d soon because I'm starting to feel a bit down lately with this winter weather and not being able to do outdoors stuff like I'm used to.
[deleted] t1_j7choe4 wrote
Snoo-11861 t1_j7cgp8d wrote
Reply to comment by MagicPistol in Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
It wakes you up and would cause poorer sleep
MeN3D t1_j7cpj2n wrote
Reply to Vitamin D supplements linked to reduced risk of suicide, study of veterans finds by thebelsnickle1991
We are animals that need sunlight to live