How do almost extinct species revive without the damaging effects of inbreeding? |
- How do almost extinct species revive without the damaging effects of inbreeding?
- Crows are all over the world, but where are crows naturally from and what kind of effect did they have as an invasive species?
- How fast does electricity travel via USB?
- Why exactly do we ever need to assume the Axiom of Choice, if it doesn't even tell us how to construct the relevant sets? What practical results need this axiom?
- How quickly does a person infected with a virus become infectious themselves?
- Is there any way to know what the Earth's rotational speed might have been prior to the collision with Theia that is theorized to have formed the Moon? And is there any chance the Earth ever experienced tidal locking/synchronous rotation with the Sun?
- Alright here me out, a theoretical balloon that will never pop and just keep stretching, what happens if you fill it with air and take it into space?
- Earth’s escape velocity is 11 km/s. What happens if we are slower than that?
- How long (in distance) is twilight?
- Did the nuclear bomb (testing) and the subsequent increase in background radiation levels lead to an increase in cancer?
- How does sonar work?
- When ice is melting on thin water why does it rotate slowly?
- When was the concept of "zero gravity" in space discovered, and was it immediately related to mass?
- How does a polarizing light microscope work?
- Why is random noise incompressible?
- Does severity of infection affect a person’s ability to donate convalescent plasma?
- What's the Difference Between Receptors and Transporters?
- Is there a minimum or maximum limit to the wavelength of gravitational waves? What kind of gravitational interactions could these correspond to?
- How do we determine the "handedness" of a race track?
- After recovery from COVID-19, does repeated exposure continue to build and prolong resistance?
| How do almost extinct species revive without the damaging effects of inbreeding? Posted: 17 Jun 2020 12:40 PM PDT I've heard a few stories about how some species have been brought back to vibrancy despite the population of the species being very low, sometimes down to the double digits. If the number of remaining animals in a species decreases to these dramatically low numbers, how do scientists prevent the very small remaining gene pool from being damaged by inbreeding when revitalizing the population? [link] [comments]  |
| Posted: 18 Jun 2020 07:44 AM PDT A short time ago I saw an eagle flying around and I was in awe of it's beauty because it's such a rare sight here, but then a murder of crows started chasing after him and eventually wore him out and got him. Then I started to wonder how eagles even exist if 6 crowd can so easily take one down, and there are so many crows around. I think I heard once that ravens are originally from Northern America and that they've been spiritual animals for some Native American cultures, but I could be wrong about that. So could it be that crows have only been in Europe and Asia for a couple hundreds of years? If so, how devastating was their arrival to the local bird population and other animals? [link] [comments]  |
| How fast does electricity travel via USB? Posted: 18 Jun 2020 05:38 AM PDT For example you have a gaming controller connected via wire to a console or PC. How fast is the electricity traveling? Would it still be close to speed of light? Does changing the wiring in such short cable matter? For example if you switch to fiber. [link] [comments]  |
| Posted: 18 Jun 2020 03:57 AM PDT |
| How quickly does a person infected with a virus become infectious themselves? Posted: 17 Jun 2020 03:33 PM PDT Current times got me thinking... If there were a stadium with 50,000 people in attendance for 2 hours and one of them had a virus and was infectious, presumably that person would infect a number of people around them. But how quickly would those newly infected people become infectious themselves? By the end of the 2 hours, how many of the 50,000 would we expect to be infected? [link] [comments]  |
| Posted: 17 Jun 2020 03:34 PM PDT I've seen writing that suggests that the Theia may have significantly increased the speed of the earth's rotation. Is there any chance that the Earth was ever tidally locked to the Sun before that collision? Do models of the collision include an ability to estimate the earth's angular velocity prior to impact? [link] [comments]  |
| Posted: 18 Jun 2020 01:02 AM PDT |
| Earth’s escape velocity is 11 km/s. What happens if we are slower than that? Posted: 17 Jun 2020 08:45 PM PDT Why can't a craft slower than that escape earth's gravity. What happens if we try? [link] [comments]  |
| How long (in distance) is twilight? Posted: 17 Jun 2020 11:37 AM PDT How far from east to west does twilight stretch at any one time? Let's say, at the equator. Thanks in advance for your answers. Praxis [link] [comments]  |
| Posted: 17 Jun 2020 11:36 AM PDT I found out today that some experiments require low-background steel, i.e. steel forged before the nuclear bomb, as steel forged after this period is contaminated with airborne radionuclides. This led me to wonder whether the increase in background radiation had an appreciable effect on cancer rates in the global population, but I couldn't find any information on this. [link] [comments]  |
| Posted: 17 Jun 2020 03:21 PM PDT I get that sonar is a device that emits sound waves and then collects their reflection and records the time taken in order to calculate the distance an object is from the source, but how does the device ensure that it will collect the sound wave upon reflection. For example if there was a smooth plane in front of the emitter, only a couple sound waves would return to the emitter upon reflection. Also how does a sonar distinguish one emitted wave from another? [link] [comments]  |
| When ice is melting on thin water why does it rotate slowly? Posted: 17 Jun 2020 09:47 AM PDT Example is here: link For some reason, it just doesn't sit still while melting, and something causes it to spin ever so slowly. [link] [comments]  |
| When was the concept of "zero gravity" in space discovered, and was it immediately related to mass? Posted: 17 Jun 2020 10:02 AM PDT Perhaps this is a melding of r/askscience and r/askhistory, but I was curious when the concept of Zero-G, or microgravity, came to be discovered or understood, and whether it was immediately correlated with the presence of mass. [link] [comments]  |
| How does a polarizing light microscope work? Posted: 17 Jun 2020 12:01 PM PDT I understand how the polarization works. I'm more confused on the ordinary/extraordinary waves that are produced after the plane polarized light passes through the material. (Side question: I still can't wrap my head around isotropy/anisotropy if someone could also explain that.) I don't understand how the second polar causes the extra/ordinary waves to create the vibrant colors in PLM or how rotating the stage causes the visible wavelength to cycle. Thank you in advance. [link] [comments]  |
| Why is random noise incompressible? Posted: 17 Jun 2020 07:42 AM PDT I was looking up whether it is possible to have an incompressible sequence. I came across this post in which people are saying that random noise is incompressible: https://stackoverflow.com/questions/9185289/uncompressable-data-sequence
However, if I came up with a random sequence of numbers I would be able to encode the data in fewer bits by recognising patterns in the data, say multiple 1s or 0s in a row. My compression algorithm could record this section of data as 'n' number of zeros, instead of writing them all out. [link] [comments]  |
| Does severity of infection affect a person’s ability to donate convalescent plasma? Posted: 17 Jun 2020 10:04 AM PDT I've just had a serological antibody test performed by my workplace for SARS-COV-2, despite never having shown symptoms for the illness. I had hoped to be able to donate plasma if I came up as positive, however in reading the donation guidelines for convalescent plasma however the criteria specifically state they require the donor to 'have fully recovered from the infection and have a confirmed diagnosis of COVID-19.' I think I'm mostly getting hung up on the verbiage used but wanted to confirm: Does presence of antibodies in plasma itself act as confirmation that a person has experienced an infection? If so, does the severity of that infection somehow affect the efficacy of donor plasma? [link] [comments]  |
| What's the Difference Between Receptors and Transporters? Posted: 17 Jun 2020 09:51 AM PDT I've been looking into the mechanism of actions of psychiatric medication and have found they primarily affect neurotransmitter transporters such as DAT, NET, and SERT. I've also found some psychiatric medication affect serotonin receptors like 5-HT1, adrenergic receptors, and dopamine receptors like D2 and D3. What's the difference between monoamine transporters and receptors? How do some medications only affect receptors and not transporters? What functions do receptors fulfill that transporters do not? [link] [comments]  |
| Posted: 17 Jun 2020 12:41 PM PDT |
| How do we determine the "handedness" of a race track? Posted: 17 Jun 2020 06:18 AM PDT When going out for a bike ride on the roads, it's usually better to pick a clockwise loop to minimize the number of left-hand turns. However, riding my bike on the local F1 track (Circuit Gilles-Villeneuve) got me wondering how we would determine the handedness of a closed loop like a racetrack. Is it about the number of turns? About how long you go in a given direction? I would assume that this is greatly affected if the race track crosses itself too? [link] [comments]  |
| After recovery from COVID-19, does repeated exposure continue to build and prolong resistance? Posted: 17 Jun 2020 10:40 AM PDT |
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