How do people colorize old photos? |
- How do people colorize old photos?
- Are our bones sensitive to cold just like our teeth are?
- Did matriarchies ever exist? If so, did they extend beyond the immediate tribe? What is the consensus in the anthropological community?
- Have any megafauna specimens besides the mammoth been recovered from the Arctic? Any similar discoveries in the Antarctic.
- Is a geostationary orbit above a place other than the equator possible?
- From the book E=mc2 and why should we care (Brian Cox and Jeff Forshaw). Why do they state that there are only two possibilities for measuring distance in spacetime and where does the act of flipping the sign in Pythagoras arise from?
- Why do people with dementia experience hallucinations? In particular, why do the vast majority experience seeing children?
- What are the main complications stopping us from having supercapacitors?
- Since mountains are changing elevation due to plate tectonics is it possible to know what the highest mountain to ever have existed was?
- Why do we use pillows now when we sleep? Did we need this during the prehistoric/ancient age? What changed?
- If weather storms are due to air moving from high to low pressure areas until there's equilibrium, how come the storms on Jupiter last continuously for centuries?
- What are the biggest efforts against climate change?
- Is there any particular reason for the number of states of matter being what it is? Could we have an arbitrary number of states between those?
- Is there a major difference between steam and fog? At a basic understanding, they’re both just water in a gaseous state right?
- Why do we stop feeling hungry when we're nauseous?
- What file format is the images and info that went along with the Voyager spacecrafts on the golden records in?
- What's the importance of rocket engine exhaust gas velocity in terms of forces acting on the nozzle?
- In cars, why do objects in the side mirror opposite the driver appear so much farther away?
- What makes a material sticky?
- Why does AM radio play with such lower quality compared to FM?
| How do people colorize old photos? Posted: 18 Mar 2018 11:55 PM PDT I saw a post about someone colorizing a black and white picture and I realized I've not thought on this until now. It has left me positively stumped. Baffled if you will. [link] [comments]  |
| Are our bones sensitive to cold just like our teeth are? Posted: 18 Mar 2018 01:43 PM PDT |
| Posted: 18 Mar 2018 07:03 PM PDT |
| Posted: 18 Mar 2018 06:22 PM PDT I recall mentions of mega-viruses and fears of dormant microbial pathogens being revived. But oddly enough, no other (extinct) megafauna remains have made any headlines, at least not recently. In particular, it would be awesome if an auroch or two, in sufficiently good condition to provide genetic material, could be used to help the various de-extinction efforts underway. But I'll settle for any frozen corpse as long as its not another mammoth. [link] [comments]  |
| Is a geostationary orbit above a place other than the equator possible? Posted: 19 Mar 2018 03:57 AM PDT Say you want a sattellite in geostationary orbit above your own house, is that possible? [link] [comments]  |
| Posted: 19 Mar 2018 03:48 AM PDT Here is the text from the book(slightly abridged). "We now have time and distance intervals in the same currency. For example, they could both be given in meters, or miles or light-years or whatever. Figure illustrates two events in spacetime, denoted by little crosses. The bottom line is that we want a rule for figuring out how far apart the two events are in spacetime. Looking at the figure, we want to know the length of the hypotenuse given the lengths of the other two sides. To be a little more precise, we shall label the length of the base of the triangle as x while the height is ct. It means that the two events are a distance x apart in space and a distance ct apart in time. Our goal, then, is to answer the question "what is the hypotenuse, s, in terms of x and ct?" Making contact with our ear- lier example x = 10 meters is the distance in space from bed to kitchen table, and t = 1 hour is the distance in time. So far, since c was arbitrary, ct can be anything and we appear to be treading water. We shall press onward nonetheless. We have to decide on a means of measuring the length of the hypotenuse, the distance between two events in spacetime. Should we choose Euclidean space, in which case we can use Pythagoras' theorem, or something more complicated? Perhaps our space should be curved like the surface of the earth, or maybe some other more complicated shape. There are in fact an infinite number of ways that we might imagine calculating distances..........In our case, the simplest way to construct a distance is to assume that at least the space part of our spacetime should be Euclidean; in other words, space is flat. This means that the familiar way of working out the distance in space be- tween objects in the room in which we are seated reading this book is carried over into our new framework intact. What could be simpler? The question, then, is how we should add time. Another simplifying assumption is that our spacetime is unchanging and the same everywhere........these two simplifying assumptions, we are left with only two possible choices as to how to calculate distances in spacetime. The length of the hypotenuse must be either s2 = (ct)2 + x2 or s2 = (ct)2 - x2. There is no other option. Although we did not prove it, our assumption that spacetime should be unchanging and the same everywhere leads to only these two possibilities and we must pick either the plus sign or the minus sign." [link] [comments]  |
| Posted: 19 Mar 2018 01:55 AM PDT My grandmother has dementia and whenever I visit her she talks about seeing children in the room with us. I'm particularly interested in this phenomena because she is blind. [link] [comments]  |
| What are the main complications stopping us from having supercapacitors? Posted: 19 Mar 2018 02:06 AM PDT |
| Posted: 18 Mar 2018 12:31 PM PDT For example the Appalachians are older then the Rockies and I've been told that at some point in history they were taller. Is it possible that the tallest mountain on earth was at one time in that mountain chain and if so is it possible for us to know what they highest peak ever was? [link] [comments]  |
| Posted: 19 Mar 2018 08:27 AM PDT |
| Posted: 18 Mar 2018 11:10 PM PDT |
| What are the biggest efforts against climate change? Posted: 19 Mar 2018 07:31 AM PDT |
| Posted: 19 Mar 2018 06:29 AM PDT I'm not really worried about plasma or BEC here, since I don't know much about these. Also, I know the question sounds a bit speculative, but I'm not really interested in what another state of matter would be like, I just mention it for discussion purposes. So, from Gibbs' phase rule we know that we can have, at best, three phases at equilibrium for a single component. Of course, this makes the solid/liquid/gas partition at triple point feel natural, since we can't have a fourth state there. However, combinations such as solid I + solid II + liquid are possible and define a triple point also, so what is stopping nature from having something like solid + arbitrary intermediate phase + liquid, where the intermediate is an imaginary, whole different state of matter? I mean, although solid I and II are both different phases, they are both solid, so it seems the phase rule can't "know" that the three states are meaningful or special. Is there something limiting the number of states of matter? Or is it a case of "well, that's what we have, I guess"? [link] [comments]  |
| Posted: 18 Mar 2018 11:53 AM PDT |
| Why do we stop feeling hungry when we're nauseous? Posted: 18 Mar 2018 04:43 PM PDT I currently have some sort of stomach bug and I've been having diarrhea all day (TMI, sorry). All I've eaten today is a granola bar (and about half a bottle of powerade) and I don't feel hungry at all. I am just curious what's going on in my body - are the mechanoreceptors in my stomach cells somehow less sensitive? Are the signals trying to tell me that I'm hungry being interrupted? Is my immune response telling my body that I shouldn't eat or I'll throw up? If so, how? TL;DR: How does being sick affect the body's ability to process information that might ordinarily tell me I should eat? [link] [comments]  |
| Posted: 19 Mar 2018 04:05 AM PDT |
| What's the importance of rocket engine exhaust gas velocity in terms of forces acting on the nozzle? Posted: 19 Mar 2018 03:42 AM PDT I try to understand thrust of a rocket engine in terms of unbalanced forces ONLY (so please do not use Newton's 3rd law for explanation. I do understand it, however IMO it doesn't explain thrust, it just shows a relation between physical quantities). While I understand forces acting on a combustion chamber and a nozzle, I can't understand why exhaust gas velocity is so important. What's more confusing to me is that with increase of gas velocity in the diverging section of a nozzle the pressure drops. Wouldn't one want to have high pressure to get some additional pushing force? [link] [comments]  |
| In cars, why do objects in the side mirror opposite the driver appear so much farther away? Posted: 18 Mar 2018 04:00 PM PDT |
| Posted: 18 Mar 2018 08:05 AM PDT |
| Why does AM radio play with such lower quality compared to FM? Posted: 18 Mar 2018 01:16 PM PDT I've always noticed that between AM and FM radio, AM's sound has always been more scratchy and unclear than FM. Does anyone know why this is? [link] [comments]  |
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