When in human history did we start cutting our hair? |
- When in human history did we start cutting our hair?
- How long does it take a virus (such as Covid-19) to reproduce from the moment it enters a cell?
- How does the body's immune system create an antibody to a novel virus it has never encountered yet? Is there some machanism of trial and error (creating random molecules)? Can those attempts create molecules that are harmful to us in the process?
- Can 1,000 unentangled particles ever have less entropy than a group of 1,000 entangled particles?
- How does the quantization of a field really work?
- Do those color blindness correcting glasses work? How?
- Does icebergs ice taste sweet or salty?
- Why can't countries still detect submarines?
- How effective are 'beauty' bar soaps really at fighting the Coronavirus?
- How do scientists know when a creature is “the last of its species”?
- Shouldn’t we be able to find the exact speed of the Earth against the “fabric of the universe”?
- Does Covid-19 survive in chlorine water?
- What causes the density trends in the s block elements?
- What is the difference between E-modes and B-modes in the cosmic microwave background ?
- Is it normal for tests that screen for viruses to be as seemingly faulty as the U.S. Corona virus ones are? Are we seeing it more just because of the scale of testing?
- How did humans decide which plants were worth cultivating?
- How many unknown diseases are discovered each year?
- Whats the difference between malignant and benign tumors?
- How does the human body turn sunlight into vitamin D, and does this ability diminish over time?
| When in human history did we start cutting our hair? Posted: 10 May 2020 07:21 AM PDT Given the hilarious quarantine haircut pictures floating around, it got me thinking. Hairstyling demonstrates relatively sophisticated tool use, even if it's just using a sharp rock. It's generally a social activity and the emergence of gendered hairstyles (beyond just male facial hair) might provide evidence for a culture with more complex behavior and gender roles. Most importantly, it seems like the sort of thing that could actually be resolved from cave paintings or artifacts or human remains found in ice, right? What kind of evidence do we have demonstrating that early hominids groomed their hair? [link] [comments]  |
| How long does it take a virus (such as Covid-19) to reproduce from the moment it enters a cell? Posted: 10 May 2020 06:24 AM PDT How fast is viral reproduction on the level a single virus? Once it enters a cell, how long does it take for it to take over the cell, create more viruses and burst forth from the host cell? Does time vary significantly from virus to virus? Are ones with shorter time generally more dangerous/infectious? [link] [comments]  |
| Posted: 10 May 2020 01:52 AM PDT |
| Can 1,000 unentangled particles ever have less entropy than a group of 1,000 entangled particles? Posted: 10 May 2020 07:11 AM PDT I'm trying to conceive of a scenario in which entanglement and entropy are positively correlated rather than negatively correlated. [link] [comments]  |
| How does the quantization of a field really work? Posted: 10 May 2020 07:10 AM PDT Let's say I turn on a radio transmitter. Using Maxwell's equations I can predict the shape of the electric and magnetic fields. But how does it relate to photons? Are the photons the same "shape" of the established electromagnetic field with just a part of its total energy? Or are they just tiny particles that make up the spatial shape of the waves just like water molecules in mechanical waves? Thanks. [link] [comments]  |
| Do those color blindness correcting glasses work? How? Posted: 09 May 2020 04:19 PM PDT |
| Does icebergs ice taste sweet or salty? Posted: 10 May 2020 07:38 AM PDT |
| Why can't countries still detect submarines? Posted: 10 May 2020 04:58 AM PDT |
| How effective are 'beauty' bar soaps really at fighting the Coronavirus? Posted: 10 May 2020 05:59 AM PDT Can these be used as an alternative or are they really that ineffective against germs? [link] [comments]  |
| How do scientists know when a creature is “the last of its species”? Posted: 09 May 2020 06:12 PM PDT |
| Shouldn’t we be able to find the exact speed of the Earth against the “fabric of the universe”? Posted: 09 May 2020 05:11 PM PDT Light has a maximum speed limit no matter what direction it's traveling. So, assuming light moves through the atmosphere at consistent maximum speeds... wouldn't anyone with a light speed measuring tool be able to set up 3 or 4 or more of these testers all orientated in different directions, with the intent of measuring the movement of the earth against the "fabric of the universe" by finding long which of the measuring devices are measuring light speed to be slower than the another? Has someone done this already? To summarize... we should be able to find the "space material" if you know what I mean. We should also be able to find the exact speed of the Earth. [link] [comments]  |
| Does Covid-19 survive in chlorine water? Posted: 09 May 2020 04:03 PM PDT My state is opening pools on memorial weekend and I have always been an avid swimmer. I am wondering if the coronavirus can survive in chlorine water. Thanks. [link] [comments]  |
| What causes the density trends in the s block elements? Posted: 09 May 2020 11:18 AM PDT In every group of the periodic table the density of the elements increases down columns (at standard conditions, and even including the predicted properties of very heavy elements and several alternate arrangements of the table) except in the alkali metals where density decreases from sodium to potassium, and in the alkaline earth metals where it decreases from beryllium to magnesium to calcium. visualization What causes these exceptions? All the alkali metals even have the same crystal packing, and the increase in atomic mass down the s block doesn't seem significantly different from other parts of the table. Thanks. [link] [comments]  |
| What is the difference between E-modes and B-modes in the cosmic microwave background ? Posted: 09 May 2020 09:08 AM PDT Hey everyone, I posted this over r/AskPhysics a few days ago but didn't get an answer so I'm trying here. I am trying to understand the current state of knowledge on the cosmic microwave background (CMB). This is obviously a broad topic and since I'm not a cosmologist I don't understand everything. I found the difference between E- and B-modes discussed here, with results from the BICEP-2 experiments: https://www.cfa.harvard.edu/~cbischoff/cmb/ The difference between the modes is explained as a difference in the orientation of the polarization, relative to the wave vector k. In the way it is depicted, the orientations don't make sense since the polarization direction should always be orthogonal to the direction of the propagation of the wave (E-mode components are said to be either parallel or perpendicular to k). There's obviously something that I don't grasp here, could someone make it clearer ? Also, the map at the top of the page is supposed to show B-modes only but it seems to show a continuum of angular values, so both E- and B-modes as explained below. Why is it not the case ? What is the fundamental difference between these modes, as E-mode waves are said to be mosty impacted by anisotropies in the early universe, while B-modes are mostly impacted by gravitational waves from inflation ? Thanks a lot for your replies! [link] [comments]  |
| Posted: 09 May 2020 03:10 PM PDT I ask because I personally know two people who have come up negative on tests, but been told by the doctor that they absolutely have it. These are two people on opposite sides of the US, so the problem seems very widespread. Just wondering if this is a normal occurrence, but is just on a higher scale or to be expected. Any other knowledge on the subject would be amazing. [link] [comments]  |
| How did humans decide which plants were worth cultivating? Posted: 09 May 2020 11:10 AM PDT A lot of agricultural staple plants we are used to were pretty much inedible at the time we discovered them as i understand. Progress in cultivation was probably not immediat. How did we decide which plants to hold on to and keep breeding even though there were plenty more alternatives already established. Furthermore are there plants we could cultivate which we just didn't? And are there fruit in our supermarkets which we can look forward to being even more enjoyable? [link] [comments]  |
| How many unknown diseases are discovered each year? Posted: 09 May 2020 06:48 AM PDT |
| Whats the difference between malignant and benign tumors? Posted: 09 May 2020 06:29 AM PDT I know a malignant tumor is basically the bad kind but what exactly are the differences and can a benign tumor turn malignant or vice versa? Are benign tumor in any way shape or form a threat? [link] [comments]  |
| How does the human body turn sunlight into vitamin D, and does this ability diminish over time? Posted: 09 May 2020 07:31 AM PDT |
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