Recent comments in /f/askscience
[deleted] t1_j4zlk9r wrote
[deleted] t1_j4zkpa0 wrote
loki130 t1_j4zjmn8 wrote
Reply to comment by citizenp in Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology by AutoModerator
I think what you'd find is that there is no consistent percentage that corresponds neatly to the way we currently divide species. Some species are a fair bit more diverse than others, and species barriers (i.e. cessation of viable reproduction) can arise from just a few mutations.
jrob323 t1_j4zjml5 wrote
Reply to comment by ozspook in Whats stopping us from sending a probe into a black hole if we haven't already? by stealth941
> If humanity really put their mind to it, went all out and built an Orion type spacecraft, we could probably get it there within 3000 years or so.
What are the chances that this spacecraft could travel at relativistic speed through space for 3000 years without encountering a speck of dust and detonating with the energy of a hydrogen bomb?
loki130 t1_j4zjh7f wrote
Reply to comment by PancakeParthenon in Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology by AutoModerator
Why would that be an issue? Insects are plenty nutritious and there are some fairly large insectivores like anteaters.
dumb_password_loser t1_j4zja46 wrote
Reply to comment by Fair-Ad3639 in Whats stopping us from sending a probe into a black hole if we haven't already? by stealth941
But the spread angle is inversely proportionate to the aperture.
If you send multiple probes that spread out a bit and couple them optically, they can transmit coherently with a huge effective aperture. (like the reverse of a telescope array)
And if the black hole is big enough, you can maybe use its gravitational field to increase the aperture using some mathematical sorcery.
[deleted] t1_j4zizqj wrote
InfernalOrgasm t1_j4ziyp1 wrote
Reply to comment by deadcommand in Given that reproduction is difficult or impossible when both animals have different numbers of chromosomes, how did so many species evolve to have so many different numbers of them? by MercurioLeCher
And at the root of it all is this magical thing called quantum mechanics; wherein particles that don't even exist ... amount to observable, tangible, forces? It's really complicated
[deleted] t1_j4ziex6 wrote
Reply to Whats stopping us from sending a probe into a black hole if we haven't already? by stealth941
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anon525as t1_j4zidhj wrote
Reply to comment by deadcommand in Given that reproduction is difficult or impossible when both animals have different numbers of chromosomes, how did so many species evolve to have so many different numbers of them? by MercurioLeCher
Idk about chromosomes part of this post's context. But adding to the evolution part for anyone who's interested.
When cells divide and grow the genetic code isn't copied 100% correctly. There are errors, some get fixed some don't. The ones that don't get fixed and continue to exist are what we call cancer.
Genetic mutation is a random thing that just happens when cell divide and grow because of not 100% being copied exactly the same. If there is a mutation which gives the individual an edge over other beings of the same species then it becomes easier for them to survive and reproduce. As their offspring increase and the ones with this mutation absent die or have less offsprings we see what we know as "nature's selection"
[deleted] t1_j4zi654 wrote
[deleted] t1_j4zi3bs wrote
BobSmithTheRockeeter t1_j4zhg8n wrote
Reply to Whats stopping us from sending a probe into a black hole if we haven't already? by stealth941
As the probe would approach black hole the time around it will slow down and it would take thousands of thousands of years for the probe to fall in, from the probe perspective it would take a couple of minutes of course. Also after it crosses event horizon we can no longer get information what’s going on as even weightless radio waves are getting pulled in
[deleted] t1_j4zhg2a wrote
Reply to comment by osomocosoRN in Is there any difference in efficacy when a vaccine is administered somewhere other than the upper arm (e.g. on the foot)? by MercurioLeCher
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liquid_at t1_j4zfr7m wrote
Reply to comment by urzu_seven in Whats stopping us from sending a probe into a black hole if we haven't already? by stealth941
I can handle both, but when switching between sources it's easy to mix things up.
Every programmer had to suffer through that inconsistency in numbers.
[deleted] t1_j4zfhhq wrote
[deleted] t1_j4zdup4 wrote
L0cked4fun t1_j4zdm0h wrote
Reply to comment by HandsOnGeek in Is there any difference in efficacy when a vaccine is administered somewhere other than the upper arm (e.g. on the foot)? by MercurioLeCher
Thanks for that, the important part is no shoulder lol.
ozspook t1_j4zdloy wrote
Reply to comment by Weed_O_Whirler in Whats stopping us from sending a probe into a black hole if we haven't already? by stealth941
If humanity really put their mind to it, went all out and built an Orion type spacecraft, we could probably get it there within 3000 years or so.
It's very helpful that the intended destination is to plunge into a black hole, this means we don't need to flip and slow down halfway, so we put more fuel mass fraction into the initial acceleration and we can just smack into it at relativistic velocities.
Transmitting back could be done by a much smaller relay satellite shot backwards some distance from the target, unfurling a massive mylar solar sail with a clever 'shutter' system, using the black hole's accretion disk or a close star as the light source, like a morse light on a ship.. We will work it out.. Of course nothing passes the event horizon but we might get some neat close up images and data for a short while.
AdEnvironmental8339 t1_j4zdd0m wrote
Reply to comment by atomfullerene in Can a recessive gene become a dominant gene? If so, how long would it take? by Pretend-Recover-4418
Thanks for you reply , very informative! And btw is the O allele is zero production of the antigen protein on the cell surface ?
_HelloMeow t1_j4zcwr3 wrote
Reply to comment by SaltyDangerHands in Whats stopping us from sending a probe into a black hole if we haven't already? by stealth941
This spacecraft is called the Parker Solar Probe, and the reason it's that fast is because of the Sun's gravity. So unfortunately we can build a spacecraft that will go 700.000 km/h wherever we want.
supagirl277 t1_j4zcn2c wrote
Reply to What specifically keeps viruses from moving from human to animal or vice versa in most cases? by cheekychessie
The way that they infect people are different because animals and humans have different proteins for them to attach to. It has to bind to a specific protein that they’ve adapted to, and if it’s not present, it can’t attach. They have to find a way into the host without getting caught, so they sort of sneak in using mechanisms that the body won’t recognize.
AdEnvironmental8339 t1_j4zcmav wrote
Reply to comment by Furrypocketpussy in Can a recessive gene become a dominant gene? If so, how long would it take? by Pretend-Recover-4418
Hey i want to ask, if the person has 2 alleles , 1 positive with sickle cells another is a normal function allele.
So is the sickle cell allele still working and you make false proteins but with the another allele still works normally then you still can be alive because your blood now consist both false hemoglobins and normal hemoglobins ( and the normal hemoglobins is in sufficient amount for you to be alive ? ).
I thought at first if an allele is reccessive and another one dominant then the reccessive allele will be locked , only the dominant will be working or switch ON. So whats wrong can you please explain..
HandsOnGeek t1_j4zbv1x wrote
Reply to comment by L0cked4fun in Is there any difference in efficacy when a vaccine is administered somewhere other than the upper arm (e.g. on the foot)? by MercurioLeCher
The injection is not supposed to be into the bicep. It's supposed to be into the deltoid.
[deleted] t1_j4zln0t wrote
Reply to Is a black hole a virtual object? by peacefultoker420
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