How can cheese be "aged" so long, but when it's in my fridge for longer than a few weeks it goes mouldy? |
- How can cheese be "aged" so long, but when it's in my fridge for longer than a few weeks it goes mouldy?
- AskScience AMA Series: My name is Margaret Race, and I work on planning human missions to Mars. Specifically, I work on behind the scenes preparation and interdisciplinary input on planetary protection. AMA!
- How does a rifle barrel regain its accuracy when cooled down after multiple consecutive shots?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- What is the smallest size of object we can see at a distance?
- Light visually bending round objects?
- Can charged ions increase airflow over a wing?
- What’s inside of oil free radiators?
- Can an FPGA (Field Programmable Gate Array) change its hardware mid-computation?
- Is there a single place on earth that is regularly vulnerable to every kind of natural disaster? Hurricanes, tornadoes, earthquakes, fire, floods, blizzards, volcanos, avalanches, mud slides, etc.
- Does frequent masturbation reduce androgen receptors?
- What (if any) are the differences between results from fMRIs of people viewing an object versus people thinking about a picture of the object?
- Is there a delay of the tides when the moon get over a specific point on hearth?
- Why do so many medications interact with MAOIs?
- How did HIV/AIDS pass onto humans?
- When family planning is it possible to screen for autism?
- Do we all see colors the same way ?
- [Chemistry] Can TNT explode in a furnace of a ship/train without a detonator?
- Is there a difference between the Z-Scheme and Non-Cyclic photosynthesis?
- Where does earth oxygen come from?
- How did burying or burning our dead become a common practice among most cultures, even isolated ones?
- Why is it said that some languages (like Assembly, C, BASIC etc) are "faster" than others (Like C++, C#, Python etc)? If all code is converted to machine code and then compiled, then why does it matter in which language it was programmed first?
- What are the sound-transmission consequences of ionizing a gas (cold plasma)?
| Posted: 27 Aug 2019 01:27 PM PDT |
| Posted: 28 Aug 2019 04:00 AM PDT My name is Margaret Race, and I work on the behind the scenes prepatation for planetary protection in planning human missions to Mars. We just celebrated the 50th Anniversary of the Apollo Moon Landings, a milestone in human achievement. We've gotten so used to headlines about new technologies, far out exploration and diverse science discoveries, that we hardly think about what goes into the planning and preparation behind the scenes. It involves way more than just rocket scientists and astronauts! (How else would a marine biologist and ecologist like me end up working with NASA on missions to Mars and planetary protection!?) It's surprising how many different types of people and careers are involved with NASA and the space community as they plan future missions, whether in Earth orbit, to the Moon, and someday, even to Mars. The careers and challenges will surprise you: it involves all the STEM fields -- science, technology, engineering and math-- and also includes input from an assortment of other fields, from law, ethics, and emergency management, to communications, movie making and even philosophy. To paraphrase Dr. Seuss: Oh, the places we'll go... and the careers we need! AMA about the assorted questions that are addressed in planning long duration space missions beyond Earth. My bio and CV: https://seti.org/our-scientists/margaret-race I'll be available for questions at 10am PDT (1 PM ET, 17 UT), AMA! [link] [comments]  |
| How does a rifle barrel regain its accuracy when cooled down after multiple consecutive shots? Posted: 28 Aug 2019 07:07 AM PDT I think physics is the appropriate flair. When a rifle with a thin barrel fires multiple consecutive shots and the barrel overheats, the rifle's repeatable accuracy is affected. When the barrel cools down, repeatable accuracy can again be achieved. Why doesn't the barrel remain in its heated and possibly warped state? [link] [comments]  |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 28 Aug 2019 08:12 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| What is the smallest size of object we can see at a distance? Posted: 28 Aug 2019 03:10 AM PDT Suppose you have a spherical ball of diameter d, placed at a distance L from you, and you have perfect eyesight, then what is the maximum distance at which you can see the ball? I read somewhere that minimum angle of resolution is around 150 micro radians. So s = rθ And at a distance of 1000 meters, the smallest object we can see is 1000*150/106 or 15 centimeters across. Is this correct? If not then how do I calculate? [link] [comments]  |
| Light visually bending round objects? Posted: 28 Aug 2019 03:55 AM PDT So I'm very curious, and can't find info on it by just vaguely googling it. Say you close one eye, and put a pen or something in close proximity of the other so it's too close to focus on, the objects in the background seem to bend and warp round the blurry edges of the pen when moved? How exactly does this work? It's really bothering me. [link] [comments]  |
| Can charged ions increase airflow over a wing? Posted: 28 Aug 2019 05:06 AM PDT Can an electric field potential increase velocity of air over a wing to produce lift? What if the angle of attack was was perpendicular to the chord line, and the velocity of airflow was accelerated by an electric field potential? I'm attempting to show that a 90° angle of attack creates upward lift if the air velocity over the "wings" camber line is greater than the velocity of air at the chord line. I want to see if it still works inside a box. I would draw a picture, but this subreddit is text only. [link] [comments]  |
| What’s inside of oil free radiators? Posted: 28 Aug 2019 04:15 AM PDT |
| Can an FPGA (Field Programmable Gate Array) change its hardware mid-computation? Posted: 27 Aug 2019 08:52 PM PDT Maybe the premise of my question is incorrect, sorry I'm new to the concept of FPGA's. Say you had an AI problem that you were writing code for with Python on an FPGA as the hardware. Could the Python script make calls to the HDL (hardware description language) to change the hardware while its solving the problem, and vice versa? Like if you wanted the software to optimize the hardware during certain parts of the problem, and the other way around. [link] [comments]  |
| Posted: 28 Aug 2019 05:48 AM PDT |
| Does frequent masturbation reduce androgen receptors? Posted: 27 Aug 2019 05:51 PM PDT I've heard that excessive masturbation reduces androgen receptors and in turn, doesn't allow your body to use testosterone. Is this true? [link] [comments]  |
| Posted: 28 Aug 2019 04:52 AM PDT Just thinking in terms of what we perceive physically versus what we recall, and if we "see" with our mind's eye or if we're just thinking of the object's attributes. [link] [comments]  |
| Is there a delay of the tides when the moon get over a specific point on hearth? Posted: 28 Aug 2019 04:27 AM PDT Is the tide late compare to the position of the moon at a perpendicular position from the ground? [link] [comments]  |
| Why do so many medications interact with MAOIs? Posted: 28 Aug 2019 04:08 AM PDT My fiancée is on Prozac. She's been developing a cold recently. I offered her some of my go-to remedies, and she turned them down because it says "do not take if you are on an MAOI", which Prozac is. But it got me thinking: why is this the case? What is it about MAOIs, or what is it about cold mess for that matter, that cause an interaction? [link] [comments]  |
| How did HIV/AIDS pass onto humans? Posted: 27 Aug 2019 11:31 AM PDT |
| When family planning is it possible to screen for autism? Posted: 27 Aug 2019 06:02 PM PDT I have a brother who's profoundly affected by his autism but no other family members who have it. I'm wondering when I'm planning to have children is there a way I can tell if my kids would be affected? [link] [comments]  |
| Do we all see colors the same way ? Posted: 27 Aug 2019 11:58 PM PDT Hi, Do we have any evidence that we all see colors the same way ? Apart from colorblind people, how can we tell than when one sees this, noone sees this ? Also, couldn't colors be specific to each indidivual ? Some kind of mind creation ? Thanks [link] [comments]  |
| [Chemistry] Can TNT explode in a furnace of a ship/train without a detonator? Posted: 27 Aug 2019 10:18 AM PDT Not sure how to flag it, so one of each it is. I've read an article on Wikipedia about Soviet partisans using pure TNT, melted from artillery shells, disguised as coal to hinder Nazi locomotive transportation. Allegedly, coal furnace conditions of high heat and pressure/not enough room to just burn - were enough for explosion to occur. But there was no sources cited. I tried to Google it, and everywhere it lead me, I've read how stable it is. How it just burns, without big badaboom. Wikipedia article on TNT itself did mentioned how "melting point of TNT is low enough for spontaneous explosion to not happen", or something along those lines, implying that there is a temperature where it might. But no elaboration on that anywhere I could find. Found a research paper on high temperature - high pressure behavior of TNT, but from what I gathered(and most of it just flew right over my feet) it does not answer my question. It was more about molecular structure or smth. And so, here I am. Help? Edit: My reddit app sends me notifications about replies, I see that there is 10 replies in total listed, but in thread I've only seen two level-1 and one level-2. Tried different app, different browsers, different accounts. Same thing. Google tells me it might be automod hiding them, but why tho? [link] [comments]  |
| Is there a difference between the Z-Scheme and Non-Cyclic photosynthesis? Posted: 27 Aug 2019 09:32 PM PDT Is there a difference between those two? My professor said that Non-cyclic just refers to the production of NADPH (not ATP) in the Light dependent reactions, and the Z-scheme refers to just what plants do, producing both ATP and NADPH. I looked online and cant find anything about a photosynthesis path that JUST produces NADPH. I know cyclic produces just ATP, but does non-cyclic just refer to the production of NADPH and Z scheme refer to the production of both? [link] [comments]  |
| Where does earth oxygen come from? Posted: 27 Aug 2019 08:32 AM PDT Ive been reading a lot of reports that 20% of the Earths oxygen comes from the Amazon Rainforest. However, I always understood that 80% of the Earths oxygen comes from phytoplankton. So this doesn't really add up since we have a lot more sources of oxygen than just these too. and even if these two numbers are close, I feel that all the trees, etc make up >5% of the worlds oxygen. What am I missing? What would be a true breakdown of the worlds oxygen by source. [link] [comments]  |
| Posted: 27 Aug 2019 01:46 PM PDT |
| Posted: 27 Aug 2019 05:37 AM PDT |
| What are the sound-transmission consequences of ionizing a gas (cold plasma)? Posted: 27 Aug 2019 10:51 AM PDT Let's take a large tank filled with some neutral gas at surface air pressure, 70 degrees in temp. We apply some very powerful charges--basically converting it to cold plasma, as close to 100% as possible. Same temps. Does mutual repulsion greatly increase the pressure? Are acoustic waves transmitted more rapidly, or with greater power? If the pressure of the plasma were reduced back to its former value, does the fact of ionization itself affect vibratory transmission on a "large" scale? And--does this affect the heat capacity of said gas? [link] [comments]  |
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