What significant differences are there between humans of 12,000 years ago, 6000 years ago, and today? |
- What significant differences are there between humans of 12,000 years ago, 6000 years ago, and today?
- How catastrophic is an earthquake for deep sea creatures?
- Why can't we have a system for dividing by zero the same way we have imaginary numbers?
- Why don't modern cellphones create interferences near speakers any more?
- How does refraction work?
- Doesn't voltage in parallel violate the laws of conservation?
- Does the size of the animal affect the number of RBCs?
- Could a hydrogen bomb use the water in oceans as fuel?
- Reading the post about Uranus and it’s 90 degree axis - Why do planets rotate to start with?
- What things in nature are a binary outcome but not really a 50/50 chance?
- Can a powerful electrical charge go through a non conductor?
- At the top of the Space Elevator, would the centrifugal force be significant enough to feel like reverse gravity?
- Why does salt water have a lower freezing point if it has stronger intermolecular force when compared to water?
- Do animals move while in hibernation?
- Do cats/dogs from foreign, faraway places interact differently than they do with cats/dogs from their own geographic region?
- Is the black layer of my microwave’s window—with lots of little holes—what stops the radiation from getting through the glass?
- Why do nuclear bombs lose power over time?
- If we had all of today's technology in Pompeii in 79 AD, could we have predicted the eruption of Mt. Vesuvius? Could we have done anything to save the city, or at least its inhabitants?
- [University Engineering] How do units squeeze through a Laplace transform?
- What happens when photons hit a single electron atom from multiple angles simultaneously?
- What is the largest organic molecule?
- I just read that the heat death of the universe is predicted to be approx 10^103 years from now, how was that number calculated?
| Posted: 03 Nov 2017 05:46 PM PDT I wasn't entirely sure whether to put this in r/askhistorians or here. [link] [comments]  |
| How catastrophic is an earthquake for deep sea creatures? Posted: 04 Nov 2017 04:12 AM PDT |
| Why can't we have a system for dividing by zero the same way we have imaginary numbers? Posted: 03 Nov 2017 09:48 AM PDT |
| Why don't modern cellphones create interferences near speakers any more? Posted: 03 Nov 2017 08:12 AM PDT 15 years ago, when my cellphone was near speakers, I'd know a few seconds before that someone was going to call, because the cellphone getting in touch/syncing with the nearest GSM relay would create interferences and the speakers would go BZZZ BZZZZZ BZBZBZ or something like that. Now, why don't modern phones do that any more? I've looked for an answer, and found some clues about why it DID that before, although I couldn't find any clear answer. Most commonly found answer has something to do with (pardon my lack of technical english) frequency bursts going from 0 (not receiving) to X MHz (X being the carrier's frequency) while syncing the call. Even if I can understand why this would create interferences, I'm wondering what has changed today, and why we don't get thoses burst interferences any more. Are modern phones always emitting/receiving, so that there are no "0 to X MHz on syncing" bursts anymore? is it a change in frequencies being used by carriers? something else? [link] [comments]  |
| Posted: 04 Nov 2017 05:19 AM PDT I understand that light "slows down" in different mediums. How does the light interact with the different medium? [link] [comments]  |
| Doesn't voltage in parallel violate the laws of conservation? Posted: 04 Nov 2017 07:13 AM PDT Alright, so the rule states that the voltage is the same across elements in parallel. So basically if you have two resistors in parallel, they both get the same voltage. What i don't understand is how does that not violate the laws of conservation of energy? Does that not create energy out of seemingly nowhere? You could just connect resistors in parallel and get more energy. Example: 10v supply, with a single 10Ω resistor connected to the circuit. That is 10w power. Add another 10Ω resistor in parallel, and you have 20w power. What's up with that? [link] [comments]  |
| Does the size of the animal affect the number of RBCs? Posted: 04 Nov 2017 03:18 AM PDT Please refer me to textbooks or scientific papers that talk about this subject. [link] [comments]  |
| Could a hydrogen bomb use the water in oceans as fuel? Posted: 04 Nov 2017 07:08 AM PDT |
| Reading the post about Uranus and it’s 90 degree axis - Why do planets rotate to start with? Posted: 03 Nov 2017 12:49 PM PDT |
| What things in nature are a binary outcome but not really a 50/50 chance? Posted: 04 Nov 2017 04:28 AM PDT For a crude example (there are exceptions of course) humans are born as either a male or female, but despite this being a 1 or the other scenario is it as clear cut at 50/50? Is one more likely than another? This question isnt just about humans at birth its for all of nature [link] [comments]  |
| Can a powerful electrical charge go through a non conductor? Posted: 04 Nov 2017 03:58 AM PDT For example, if I were to touch and immensely powerful electrical charge using only a small piece of rubber could it still shock me? [link] [comments]  |
| Posted: 03 Nov 2017 09:31 PM PDT Here's a diagram of what I'm talking about: https://upload.wikimedia.org/wikipedia/en/2/20/Space_Elevator_Schematic.jpg You're standing in the space station at the top of the cable which is orbiting around the earth beyond geostationary orbit. The centrifugal force keeps the cable aloft, but it also means that anyone at the top should feel a force akin to reverse gravity up there. Could you build a space hotel at the top of the cable? [link] [comments]  |
| Posted: 03 Nov 2017 10:15 PM PDT "Since ethanol molecules aren't as sticky as water molecules, the temperature has to be a lot lower before the forces of attraction overcome the energy of motion and fix the molecules into their array sites. So, that's why alcohol has a much lower freezing point" In this article (https://news.ncsu.edu/2011/07/wms-alcohol-freezing/), it states that ethanol has a higher freezing point than water's because it has weaker intermolecular force. However, salt water has a lower freezing point and stronger intermolecular force than water. https://www.linkedin.com/pulse/why-does-adding-salt-increase-boiling-point-water-ganesh-tingare Also this website states that "The ion-dipole interaction [of salt water] is stronger than the hydrogen bonding between the water molecules" [link] [comments]  |
| Do animals move while in hibernation? Posted: 03 Nov 2017 03:44 PM PDT Humans and (many) animals move while sleeping. Do they also move in hibernation? [link] [comments]  |
| Posted: 04 Nov 2017 01:09 AM PDT Ignoring obvious differences in spoken languages, it's pretty easy to identify strange/unusual mannerisms and nonverbal language used by people from other cultures. If a cat or a dog were taken from, say, SE Asia and brought to the Midwestern US, would local Midwestern US cats/dogs interact with that cat/dog differently than they would with one from, say, a different region of the US? Have there been any studies on this? I'm just curious as to whether cats/dogs develop noticeably different methods or styles of communication from one region of the globe to another. [link] [comments]  |
| Posted: 03 Nov 2017 02:11 PM PDT Are the holes smaller than the wavelength so it blocks the radiation, or does it serve some other purpose? If it is something else, what stops the radiation from going through the glass? [link] [comments]  |
| Why do nuclear bombs lose power over time? Posted: 03 Nov 2017 07:50 PM PDT |
| Posted: 03 Nov 2017 07:44 PM PDT Reading Wikipedia, I learned that there were precursor earthquakes prior to the eruption, but people ignored them as earthquakes were common in the area. Could today's scientists connect those earthquakes to volcanic activity and issue evacuation orders, or some other countermeasures? Are there any other signs of the coming eruption that we could detect using today's technology? [link] [comments]  |
| [University Engineering] How do units squeeze through a Laplace transform? Posted: 03 Nov 2017 12:31 PM PDT Can someone help me understand how units shift around through a Laplace transform? I'm looking at an RLC circuit in the time domain, and I can understand that just fine. I can mostly see how to draw it up in the s-domain but I'm getting lost on keeping track of my units. I want to build the equations in terms of volts, because I'm using KVL. [link] [comments]  |
| What happens when photons hit a single electron atom from multiple angles simultaneously? Posted: 03 Nov 2017 11:00 PM PDT Does the electron cloud absorb both photons or just one? Does the nuclei absorb the missed photon? [link] [comments]  |
| What is the largest organic molecule? Posted: 03 Nov 2017 10:48 AM PDT I've been learning organic chemistry, about molecules like CH4 and C2H6, and was wondering how big they got. Like how many carbons and hydrogens does the biggest one have? [link] [comments]  |
| Posted: 03 Nov 2017 08:11 PM PDT |
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