- I've heard that the surface of a fast spinning neutron star(pulsar) rotates at about 5th the speed of light with respect to the centre. If so, then would the periphery experience Lorentz contraction? How would it affect the structure of the star?
- What makes honey "non-spoilable"?
- Why do lights always flicker when watched from very far away?(like a city on the horizon)
- Standing waves in space?
- What are the sources of error with atomic clocks?
- How does the brain determine which part of the body is experiencing a sensation?
- How viscous is liquid metal?
- How can the bacterial content of cheese be guaranteed to be the same or similar over time?
- Are higher mass isotopes more dangerous than lower mass?
- Why is the Planck length important and how was it measured?
- Do chameleons have melanophores?
- How do scientists determine the half-life of elements which take billions of years to decay?
- How is blood produced, and how does the body one when to stop producing blood?
- What is the oldest human skeleton/remains that have been found from ancient times?
- If an impact event occurred in the ocean, during the past, what evidence would we find today that it had happened?
- Do celestial events visible from Earth (like the birth of a star) take place in the past?
- To all doctors/surgeons, how are the organs in our body held in place?
- water boiling in a vacuum does it get hot?
- Is there a difference between denoting a single 10 megaton nuke and two 5 megaton nuke in succession?
- How do Radar and Lidar technologies, as used in autonomous vehicules, differenciate between their signal and the signal of a similar model?
- How do radio frequencies not constantly collide and how does bandwidth work?
- Why is the gram the SI base unit, and not the Kilogram?
| Posted: 22 Nov 2018 05:30 AM PST I think I'm probably referring to the Ehrenfest paradox but I would like to know what happens to a neutron star which is rotating rapidly. Thanks. [link] [comments]  |
| What makes honey "non-spoilable"? Posted: 22 Nov 2018 02:10 AM PST Pretty much the title. Once my uncle found honey jar in the basement of his house which was stored there by my grand grandfather in early 1900's presumably, we ate it ( and didn't die). [link] [comments]  |
| Why do lights always flicker when watched from very far away?(like a city on the horizon) Posted: 21 Nov 2018 10:45 PM PST |
| Posted: 22 Nov 2018 01:52 AM PST When you put a bowl of water or sand on a subwoofer, you will get beautiful stort of standing waves. Were there experiments performed, where water bubbles in weightlessness were exposed to similar stimulation? I was thinking of it, as experiments like that could contribute to our understanding of the atomic structure, I suppose. If yes, what were the results? Did the resulting forms resemble anything familiar? [link] [comments]  |
| What are the sources of error with atomic clocks? Posted: 22 Nov 2018 12:24 AM PST Atomic clocks are so accurate that they only lose one second every fifteen billion years. Why do they lose that second? [link] [comments]  |
| How does the brain determine which part of the body is experiencing a sensation? Posted: 21 Nov 2018 10:22 PM PST How does the brain tell if a signal is coming from your pointer finger or middle finger? If All of the signals feed into the same place, how can the beak tell any difference? Are there different signals for each neuron? [link] [comments]  |
| Posted: 22 Nov 2018 06:35 AM PST I've seen videos of both people appearing to stir liquid metal with long metal poles and videos of liquid steel spilling out of a container. How viscous is it? [link] [comments]  |
| How can the bacterial content of cheese be guaranteed to be the same or similar over time? Posted: 21 Nov 2018 09:13 PM PST This question started after seeing a Youtube video on the production of Parmesan cheese; specifically, Parmesan-Reggiano cheese. I find this instance of cheese interesting for a few reasons: it is a very unique cheese, supposedly only truly producible in the specific regions of Parma, Reggio Emilio, Bologna, Modena, and Modena, in "the same lands the monks made it over 1000 years ago". This claim is reinforced by the consistent bacterial content of the cheese, containing bacteria supposedly found only in the region, which is fed into the cows that then produce the milk to make Parmesan-Reggiano cheese. This cheese production process is also carefully monitored and measured through virtually every step, helping to guarantee the end product. But, while I understand that there is a strict method to this cheese's production, and carefully measured controls at virtually every step, I find myself doubting that the bacterial content of the cheese can be so carefully controlled. My mind goes to proliferation of super bacteria in sterilized environments for instance; granted that these areas present limited or no competition for these super bacteria, who can reproduce at alarming rates freely due to lack of competition. But even then, these sterilized environments are supposed to be carefully controlled as well. Even in an area of intense competition, there are still traces of super bacteria amongst the flora of other bacteria. To substance my doubts, the video referenced even says that "bad bacteria" are present along with the "good bacteria" in the vat, but that cooking the milk removes all the bad bacteria as a result. But aren't there bacteria that can adapt to harsh temperatures? Wouldn't this mean, even eventually, that these bad bacteria would become more prevalent in the cheese? Given these observations, my question is ultimately: How can the bacterial content of cheese be guaranteed to be the same or similar over time? Furthermore, is there reason to be concerned that cheese production, especially under controlled conditions, is producing resistant super-bacteria in the very vats it is being made in? Love to hear feedback on this, as my curiosity is stoked. Appreciate the time as always! [link] [comments]  |
| Are higher mass isotopes more dangerous than lower mass? Posted: 22 Nov 2018 04:21 AM PST I became curious about smoke detectors and found out that isotopes have different mass numbers beside them, and i'm curious what makes different isotopes more dangerous, is it higher mass = more danger or is it a combination between neutrons, electrons, protons, and mass? [link] [comments]  |
| Why is the Planck length important and how was it measured? Posted: 22 Nov 2018 12:25 AM PST |
| Do chameleons have melanophores? Posted: 22 Nov 2018 03:53 AM PST So as far as I'm aware chameleons have a layer of xanophores and then below it 2 layers of iridophores containing crystals that they can change the spacing between to reflect different shades of visible light in the the upper layer and infra-red light in the lower layer. What I'm not sure about though is do chameleon's have a layer of melanophores below the other layers. Some websites say chameleons have melanophores but I'm pretty sure they only assumed that as the mechanism they said was responsible for their colour change is no longer thought to be responsible for their colour change. [link] [comments]  |
| How do scientists determine the half-life of elements which take billions of years to decay? Posted: 21 Nov 2018 03:55 PM PST I guess it's simple with transuranic elements that decay very fast and rapidly stop emmiting detectable radiation. But what about elements such as Rubidium-87? [link] [comments]  |
| How is blood produced, and how does the body one when to stop producing blood? Posted: 21 Nov 2018 03:24 PM PST |
| What is the oldest human skeleton/remains that have been found from ancient times? Posted: 22 Nov 2018 03:19 AM PST Not in millions of years, but the age when the person died. I can't figure out how to phrase it to get meaningful results from searches. What I'm trying to find is some kind of 20,000+ year old remains of persons who lived to a ripe old age. [link] [comments]  |
| Posted: 21 Nov 2018 03:55 PM PST I know with land based impacts obviously you get the impact crater and its easy to find the detritus. What evidence would scientists use to locate and identify ocean based impacts that may have occurred hundreds or thousands of years ago. [link] [comments]  |
| Do celestial events visible from Earth (like the birth of a star) take place in the past? Posted: 21 Nov 2018 01:42 PM PST This is going to take a bit of a twist. It's my understanding that nothing travels faster than light. Based on that, if a catostrophic celestial event occured many light years away and it resulted in doom for humans, our doom would be visually apparent for some time before we were affected. Correct? Simple Example: Per Google, the black hole at the center of our galaxy is estimated to be 25,000 light years from our solar system. If some catastrophic event occurred at the center of the milky way and it destroyed our galaxy... would it take 25,000 years for us to be aware of our fate? Is it possible for an initial event of destruction to have occurred 20,000 years ago, and for us to be completely unaware today? [link] [comments]  |
| To all doctors/surgeons, how are the organs in our body held in place? Posted: 22 Nov 2018 01:46 AM PST |
| water boiling in a vacuum does it get hot? Posted: 21 Nov 2018 07:08 PM PST i have seen videos where water boils in a vacuum. but does the water get hot, like in a kettle the heat comes from the element and the water boils. is it just bubbling water or is it really hot. [link] [comments]  |
| Posted: 22 Nov 2018 12:57 AM PST |
| Posted: 21 Nov 2018 10:07 AM PST If I understand the working principle of Radar correctly, one emits a signal and analyse the reflected signal. It can be used to measure speed via the Doppler effect or distance by measuring the time a signal took to bounce and be recaptured by sensors. But then, if someone were to emit a similar signal as the one used by your radar device, wouldn't the radar detect it and mistake it for its own, thereby creating potentially unwanted behavoir down the line? I also wonder how frequent those events would be in, say, trafic with a few autonomous vehicules of the same brand. [link] [comments]  |
| How do radio frequencies not constantly collide and how does bandwidth work? Posted: 21 Nov 2018 04:02 PM PST Hi Reddit, Two questions around the same lines. Firstly, If I had three radios transmitting, 1 at 1hz, one at 2hz, one at 4hz, would a receiver only see data arrive when they don't collide? The 1hz signal would always collide with 2hz and 4hz, the 2hz would always collide with 4hz and the 4hz would only have the first and third piece arrive with no collision? Secondly, when trying to understand bandwidth, if I had a radio using 20mhz of bandwidth on a 2ghz radio, does the transmitter encode data on 2,000,000,000 and on 2,000,000,001 and so forth up to 2,019,999,999? I really struggle understanding this part of radio frequency and cannot wrap my head around it. Thanks in advance [link] [comments]  |
| Why is the gram the SI base unit, and not the Kilogram? Posted: 21 Nov 2018 07:53 PM PST Pretty much all physical SI base units make relatable scale sense, bar the gram, what gives? I know how much a Litre is in volume, and for water it's close to a kilogram, but why isn't it a gram instead? [link] [comments]  |
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