Do people of all cultures report seeing "their life flash before their eyes" when they (almost) die? |
- Do people of all cultures report seeing "their life flash before their eyes" when they (almost) die?
- The difference between Gold and Mercury on the Periodic Table is one Proton. If I add one proton, solid Gold turns into a silvery liquid metal that's extremely toxic to humans. How can the addition of a single proton have such a profound effect on an element's properties?
- If stars conserve angular momentum when they collapse into a black hole, shouldn't the rate at which the black hole spins that tell us that whatever is in the center of a black hole has a measurable diameter rather than being an infinitely dense point?
- How EXACTLY do Two-Higgs-Doublet Models work?
- what is the difference between a space time graph and a normal distance time graph??
- How can our brain distinguish between sound coming from above and sound coming from below?
- If drugs themselves do not cause addiction, how do we explain withdrawal?
- How smart are octopi? I know they can solve puzzles and mazes and open lids to jars, but how to they compare to humans? Are they as smart as a young child, for example?
- How were the temperature scales derived?
- Will a Strong Enough Electric Field Permanently Break an Intermolecular Dipole Dipole Attraction?
- How are some images taken using an electron microscope?
- If the law of physics are the same regardless of what frame, does a stationary charge experience a Lorentz force when a magnet moves near it?
- Are there some cases where, given the Oberth effect, you'd actually want to release reaction mass at a lower velocity?
- Can we align the direction of an atom's electrons?
- Does Biologic Carbon Sequestration Actually Help Stop Long Term Climate Change?
- What is happening on the molecular level as paint (or any similar substance) is "drying"?
- How does compound ear pro work in terms of NRR?
| Do people of all cultures report seeing "their life flash before their eyes" when they (almost) die? Posted: 03 Feb 2019 07:33 PM PST In general, is there any universal consistency between what people see before they die and/or think they are going to die? [link] [comments]  |
| Posted: 03 Feb 2019 12:14 PM PST |
| Posted: 03 Feb 2019 08:48 PM PST After all, if there were an infinitely dense point with no diameter at the center of a black hole, wouldn't the black hole have to spin infinitely fast? [link] [comments]  |
| How EXACTLY do Two-Higgs-Doublet Models work? Posted: 04 Feb 2019 03:14 AM PST I've become fascinated in particle physics as of late. However I can't wrap my head around these swanky models. For instance, one old one I've found is the Peccei-Quinn model. So this is a theory that there is an extra particle, an Axion. Got it. However, how does this interact with a Higgs Field? What does it tangibly do? And why does it solve the CP problem? I'm really concerned I've gotten confused with my terminology here, because this paper discusses Peccei-Quinn and 2HDM as if they're related but there's little else I can find on the topic. [link] [comments]  |
| what is the difference between a space time graph and a normal distance time graph?? Posted: 04 Feb 2019 02:40 AM PST |
| How can our brain distinguish between sound coming from above and sound coming from below? Posted: 03 Feb 2019 01:09 PM PST |
| If drugs themselves do not cause addiction, how do we explain withdrawal? Posted: 03 Feb 2019 03:41 PM PST Been seeing a lot of literature and videos suggesting that our conceptions about addiction are entirely wrong, suggesting that the change in cognition and behavior etc. is not caused by "chemical hooks", but by processes that govern learning and bonds. In case I need to explain myself a little: Kurzgesagt did a very snappy, digestible video on the misconceptions surrounding addiction here that's been widely proliferated). I also found a presentation here by a published research chemist to that effect that is significantly more thorough but difficult to watch. If this is true, then how does opiate withdrawal or delirium tremens fit into this equation? [link] [comments]  |
| Posted: 03 Feb 2019 12:56 PM PST |
| How were the temperature scales derived? Posted: 03 Feb 2019 12:09 PM PST Hey, so I am aware that 0 °Celsius the freezing point and 100° the boiling point of water at sealevel is. However when it was introduced how were the the points between 0-100° estimated. Like how could you establish how "hot" 30° was. Did they meassure the density of the water or what? I jope my question is kind of unnderstanable [link] [comments]  |
| Will a Strong Enough Electric Field Permanently Break an Intermolecular Dipole Dipole Attraction? Posted: 03 Feb 2019 12:12 PM PST Suppose I've got borosilicate (mostly composed of SiO2 & B2O3), and due to the Diboron trioxide has dipole moment. If a place the borosilicate in an electric field, the dipole moment of the 'other molecules' will experience torque towards the direction of the electric field. If the bond direction is perpendicular to the electric field will this cause intermolecular bond to permanently rupture? [link] [comments]  |
| How are some images taken using an electron microscope? Posted: 03 Feb 2019 10:41 AM PST I saw this post where a picture of a needle and a thread was taken using an electron microscope. But I've read that for an electron microscope the samples have to be dried and sliced into thin pieces. So, how was this picture taken? [link] [comments]  |
| Posted: 03 Feb 2019 12:06 PM PST |
| Posted: 03 Feb 2019 12:01 PM PST I was thinking about the Oberth effect, and the implications of leaving your propellant at a lower orbit with less potential energy. I was thinking: what would be the best way to extract all the energy possible from that reaction mass? Well, that would be to leave the propellant with zero potential and zero kinetic energy, but given that is impossible (maybe except for at the event horizon of a black hole?), with zero kinetic energy and minimal potential energy. So here's the question that lead to the question: do I waste energy by burning propellant _faster_ than I am going, and thus sending both myself and the propellant to a higher orbit? I know that's not the case, as you get ISP from exhaust velocity, but is there any benefit in doing so, and why _isn't_ this the case? Thanks! [link] [comments]  |
| Can we align the direction of an atom's electrons? Posted: 03 Feb 2019 08:04 AM PST In the Wikipedia page for Neodymium magnets, it is stated of the magnet's construction:
Is it not true that our understanding of electrons has progressed to the point where we now know that they are quantum variables, that they are mathematically in all places at once? How, then, could we be aligning their paths to create a magnetic field? [link] [comments]  |
| Does Biologic Carbon Sequestration Actually Help Stop Long Term Climate Change? Posted: 03 Feb 2019 06:22 AM PST There is this popular belief that trees or plants help prevent climate change by sequestration of carbon dioxide. But I believe that over the long term (100 to 1000 years) the tree will have died and released all of the carbon dioxide back into the atmosphere. So growing some plants might reduce carbon dioxide in the short term but longer term will have no effect. What am I missing? [link] [comments]  |
| What is happening on the molecular level as paint (or any similar substance) is "drying"? Posted: 03 Feb 2019 07:12 AM PST |
| How does compound ear pro work in terms of NRR? Posted: 03 Feb 2019 06:29 AM PST If you wear 24nrr earmuffs over 24nrr earplugs, will that give you a 33nrr overall, or is that now how it works? [link] [comments]  |
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