What determines the ideal number, length, width and shape for the blades of wind turbines, wind mills, or even interior fans? |
- What determines the ideal number, length, width and shape for the blades of wind turbines, wind mills, or even interior fans?
- Is licking a minor wound (such as a small cut) generally effective or harmful?
- Why, physically, can’t we see ultraviolet light?
- AskScience AMA Series: I'm Futurist Amy Webb, and I just wrote a new book about a wild emerging technology called synthetic biology. AMA!
- How is a cold virus able to target specific areas of the body, ie the throat?
- do large Cities affect weather in any significant way?
- Can heat affect electric signals?
- How do flash floods happen?
- Melting ice sheets lead to isostatic rebound and earthquakes. Are any mountain glaciers big enough to cause detectable earthquakes by the same process?
- How would palaeontologists know the social structure of dinosaurs?
- Why is glycemic index of sucrose lower than all purpose flour even though all purpose flour isn't as sweet as sugar?
- How do mountain rivers formed and how do they look like at the mountain top?
- What is the data on medical marijuana messing with REM sleep?
- Does vapour pressure depend on external pressure?
- If you have a slightly damaged liver, but donate or otherwise remove a portion of it. will the liver as a whole be healthier once it fully regenerates?
- Do new galaxies become visible as their light reaches Earth?
- Are studies related to humans that use worms as the subject relevant to human living?
- Why do rock sediment layers change color so suddenly?
- The human mind compensates for our noses and blind spots, but what is known of animals with long snouts like dogs and horses? How about creatures like stingrays?
| Posted: 31 May 2022 10:37 PM PDT I notice that wind turbines have only three very long blades, yet windmills and water pump windmills have many more. Likewise, home fans can have three, five, or more blades, and there is a lot of variation in the lengths available. How do you determine what's optimized for a given usage? [link] [comments] |
| Is licking a minor wound (such as a small cut) generally effective or harmful? Posted: 31 May 2022 04:57 AM PDT And does being immunocompromised make a difference? ETA: I'm not immunocompromised, sorry, didn't realise people would draw that conclusion. I was just curious about what would happen if an immunocompromised person did lick a cut. Clearly, it's nothing good. The reddit app isn't letting me reply to posts, but thanks to all who've answered so far! [link] [comments] |
| Why, physically, can’t we see ultraviolet light? Posted: 31 May 2022 12:29 PM PDT I understand why we can't see infrared light, because it's way less energetic than visible light, but ultraviolet is even higher energy and I thought it would still make sense for it to excite our retinas. The only answer I can find is "because your eyes only see blue light", but that doesn't really answer the question of how or why that mechanism actually works. [link] [comments] |
| Posted: 01 Jun 2022 04:00 AM PDT We can now program cells as if they were tiny computers. What happens when anyone can manipulate organisms - or even create new ones? My new book, The Genesis Machine, gives you the background you need to think differently about research underway now, and what that could mean for humanity's futures. What questions do you have for me, Redditors? I'll be on from 2-4pmET (18-20 UT), AMA! Username: /u/Amy_Webb [link] [comments] |
| How is a cold virus able to target specific areas of the body, ie the throat? Posted: 31 May 2022 03:39 PM PDT |
| do large Cities affect weather in any significant way? Posted: 31 May 2022 06:21 AM PDT I live in Minneapolis, MN and now that it's summer there have been a few big thunderstorms. I was wondering if the large city affects how these storms behave. [link] [comments] |
| Can heat affect electric signals? Posted: 31 May 2022 06:07 AM PDT So, here's my simplistic understanding of the two terms: Electricity- the flow of electrons Heat - the general movement of particles/molecules. While these are not perfect definitions, I think they are fairly accurate. If you have electrical signals flowing through a copper cable, why can heat not change the bits being transmitted by disrupting the flow? I realize that heat is a problem in computing, but usually that is at the processing points and affects materials in the computer rather than the signals, right? [link] [comments] |
| Posted: 31 May 2022 06:33 AM PDT |
| Posted: 31 May 2022 08:15 AM PDT |
| How would palaeontologists know the social structure of dinosaurs? Posted: 30 May 2022 11:20 PM PDT Hello, I just watched Prehistoric Planet and then perused the Wikipedia pages of some of the featured dinosaurs. For example, how would they know that the Dreadnoughtus males go into the desert to compete to mate? (I suppose they found a whole bunch of male fossils?) Or the father T-rex wants to eat first? Or the group of Triceratops journeying through a cave to find an underground clay lick, to protect themselves from eating toxic plants by lining their stomachs? Or the pterosaurs fighting back against the Velociraptor hunting them? Or the Quetzalcoatlus (I think it was) crushing the other's eggs? The Edmontosaurus loves fire or something like that? Or a smaller Barbaridactylus fools the bigger males into getting to mate with females? I haven't researched it further but none of this is in the respective Wikipedia pages, how much of this is educative guesses and story telling? [link] [comments] |
| Posted: 31 May 2022 01:22 AM PDT |
| How do mountain rivers formed and how do they look like at the mountain top? Posted: 31 May 2022 10:34 PM PDT |
| What is the data on medical marijuana messing with REM sleep? Posted: 30 May 2022 11:50 PM PDT I saw a bunch of studies and assertions that it ruins REM sleep. But I also saw stuff that says it's a miracle for sleep and anxiety and nightmares. These things don't seem to coalesce into one pattern; if it helps with anxiety, then it can't also not let you get real rest, becuase over time you would get worse anxiety from not being able to sleep. Bad sleep=more anxiety. Ditto nightmares, if you can't get real rest, then you get more nightmares. So what's going on? Is the data conflicting, does it matter who's being studied and why they're taking the drug, does it matter what particular type of thing they're taking, what ingestion method? [link] [comments] |
| Does vapour pressure depend on external pressure? Posted: 31 May 2022 04:22 AM PDT My understanding of vapour pressure is that it is the pressure exerted by a vapour above a liquid when at equilibrium. Physically, this arises because some molecules have enough energy to escape from the liquid phase in to the gas phase, and at equilibrium the number of molecules vapourising is the same as the number condensing. My question is does the vapour pressure depend on the external pressure? For example, if a volatile solvent was placed in a sealed flask, and it was pressurised with an inert gas, would the additional gas molecules hinder the evaporation from the liquid phase? [link] [comments] |
| Posted: 30 May 2022 06:48 PM PDT |
| Do new galaxies become visible as their light reaches Earth? Posted: 30 May 2022 09:41 PM PDT Do galaxies beyond the bounds of the currently observable universe become visible as their light reaches Earth or are they simply too far away or obscured to ever be observed? [link] [comments] |
| Are studies related to humans that use worms as the subject relevant to human living? Posted: 31 May 2022 03:37 AM PDT I was reading some health (diet) related articles and they were talking about possible health concerns of diets due to the way ringworms reacted when subjected to said diet. That sounds super strange to me because...I'm not a worm... Was just wondering if those articles should just be dismissed or if using worms for studies related to humans is actually a scientifically sound practice. [link] [comments] |
| Why do rock sediment layers change color so suddenly? Posted: 30 May 2022 06:19 PM PDT Since these formations took millions of years to form, wouldn't it be a subtle change over time? And yet, when I look at the formations, the colors seem to change quickly. Why is this? [link] [comments] |
| Posted: 31 May 2022 05:27 AM PDT Offered my golden retriever my breakfast scraps and noticed he carefully looked down at all the bits of eggs, toast and bacon before raises his head back up and then accurately licking each tidbit without looking? Did his doggy brain create a map of the food bits or was his brain "showing" him the plate even though his adorable snout was in the way? [link] [comments] |
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