Why can't you refuel while the engine is running? |
- Why can't you refuel while the engine is running?
- SARS-Cov-2 has been found in dogs, deer, primates, bats, etc. is it common for a virus to be so widely spread between species?
- The situation with bee Colony Collapse across the world: Have bans against certain pesticides made an impact?
- How do hospitalization rates among unvaccinated individuals due to the Delta variant compare to those of previous strains?
- Does the half-life of atoms change depending on the molecule they are in? So for example can the half-life of any uranium isotope be any different if it's bound in uranium fluoride or sth.?
- When deciduous trees prepare for winter, is the trigger from the local weather or from the sun light’s intensity?
- Why is Galactosylation of total immunoglobulin G (IgG) anti-inflammatory?
- Where does the energy go during the latent heating phase?
- How does altitude affect tree growth?
- If gravity bends light particles, is it possible we see some stars twice ?
- What do we know about Covid reinfection risk with the delta variant?
- Why are vaccines not given to adults as they are developed?
- How can we see things beyond the Oort Cloud if we cannot see the Oort Cloud itself?
- Why are there clumps of atoms of the same element (such as iron) in Earth's crust?
- Why don't Orcas attack humans?
| Why can't you refuel while the engine is running? Posted: 02 Aug 2021 11:18 AM PDT I know this 'rule' in the context of cars, but I assume also true for airplanes and boats. Why is this the case? Its not like refuelling opens the combustion chamber... And if fumes are the ones in danger to ignite, couldn't that happen from the petrol in the tank anyway? Excuse my poor knowledge of internal combustion engines ! Edit: Thanks for all the answers. To simplify, I will make a clarification before going to sleep; for a car in a gas station, what would cause ignition? The electrical wiring? The buildup of static charge? The heat in the engine components? Or the engine's combusting? ... For a brand new car what would be the main danger, and how has this changed over the years i.e. by using different materials / engine design? [link] [comments]  |
| Posted: 02 Aug 2021 02:07 PM PDT |
| Posted: 02 Aug 2021 06:22 PM PDT I'm not fully informed on the topic, but to my understanding, EU banned certain pesticides and the US have not. What's the 2021 situation on pollinators in the EU vs the US? [link] [comments]  |
| Posted: 02 Aug 2021 06:00 PM PDT With COVID-19 cases on the rise once again, one thing that has become clear is the fact that nearly all patients who are hospitalized as a result of infection with the Delta variant of SARS-CoV-2 have not yet received any form of immunization against the virus. However, what's less obvious is the likelihood of hospitalization between relevant strains of the virus among unvaccinated comparable populations. Have there been any reviews that have looked into differences in hospitalization risk between these variants? [link] [comments]  |
| Posted: 02 Aug 2021 11:42 AM PDT |
| Posted: 02 Aug 2021 04:06 PM PDT If it stayed 90°F into November/December at latitudes 40-45°N, would the trees remain green or would they still lose their leaves due to decreased daylight hours/light intensity from being tilted away from the sun? Or maybe even lose their leaves triggered by an internal clock coded within the tree's genetics [link] [comments]  |
| Why is Galactosylation of total immunoglobulin G (IgG) anti-inflammatory? Posted: 03 Aug 2021 01:18 AM PDT anti-inflammatory in the sense that digalactosylated N-glycans reduce glycanage? (also why is sialic acid also anti-inflammatory when attached to the terminal chain of an IgG?) What is the upstream effector of both? https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5867308/ [link] [comments]  |
| Where does the energy go during the latent heating phase? Posted: 02 Aug 2021 04:27 PM PDT I understand temperature is the average kinetic energy of a substance, basically how fast the disordered motion of each molecule is. What I don't understand is why the temperature should stop increasing at the phase transition temperature until the latent heat has been overcome? For a solid melting, why do the molecules collectively "decide" to stop moving faster once they reach the melting point, wait until they get enough energy (which is going where? Loosening/widening the intermolecular bonds?), and then what causes the sudden phase transition, followed by increasing in temperature normally again? Why does the phase transition depend on the overall temperature of the bulk instead of being more or less molecule-for-molecule? Also, why is the latent heat different for fusion and vaporization for water, what exactly is different about the hydrogen bonds in ice and in liquid if the molecules are the same? Please explain in physical instead of mathematical terms, I want to know what's going on with the molecules themselves in space. Thank you for any answers. [link] [comments]  |
| How does altitude affect tree growth? Posted: 02 Aug 2021 03:59 PM PDT Aside from differences in nutrients and soil composition, climate and temperature, would partial pressure differences of gases (esp oxygen and water) in the atmosphere affect tree growth? Also, would the rate of oxygen release of trees in higher altitudes vs lower altitudes differ? Any papers would also be appreciated! [link] [comments]  |
| If gravity bends light particles, is it possible we see some stars twice ? Posted: 02 Aug 2021 02:20 PM PDT For example: [link] [comments]  |
| What do we know about Covid reinfection risk with the delta variant? Posted: 02 Aug 2021 11:31 AM PDT I've seen lots of coverage regarding the incidence of "breakthrough" delta variant infections in vaccinated people, but what is the data telling us about the risk to people who were previously infected and not otherwise vaccinated? [link] [comments]  |
| Why are vaccines not given to adults as they are developed? Posted: 02 Aug 2021 01:25 PM PDT When i was young, lots of vaccines which my child gets now did not even exist. Some of those diseases are very dangerous (meningitis). Why don't we adults get these vaccines. Can I just go and get all the vaccines my child gets (MMR, Varicella and everything) because I really do not know what I got 4 decades back! [link] [comments]  |
| How can we see things beyond the Oort Cloud if we cannot see the Oort Cloud itself? Posted: 02 Aug 2021 06:02 PM PDT |
| Why are there clumps of atoms of the same element (such as iron) in Earth's crust? Posted: 02 Aug 2021 11:37 AM PDT I hope my question is clear enough. Essentially, given that Earth and the solar system formed from wafting gas and dust of all kinds of elements, how come there are things like "iron deposits" on Earth that have trillions upon trillions of iron atoms all together with each other homogenously? How come iron atoms on Earth aren't "all mixed together" with other elements' atoms? [link] [comments]  |
| Why don't Orcas attack humans? Posted: 01 Aug 2021 08:29 PM PDT These aquachads have teeth that would give batman nightmares and are the absolute apex predators of three quarters of the planet (with the other 25% being land), and prey on things as fearsome as Great White sharks, which do eat humans, even if very rarely. And yet, whenever the subject of orca predation is discussed on documentaries and such, it's always mentioned that no wild Orca has ever killed and eaten a human even once in all of recorded history. Why is that? [link] [comments]  |
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