- AskScience AMA Series: I'm Mark Jacobson, Director of the Atmosphere/Energy program and Professor of Civil and Environmental Engineering at Stanford University, and author of 100% Clean, Renewable Energy and Storage for Everything. AMA about climate change and renewable energy!
- In a crystal, how do electrons and holes move?
- Why do we measure medication times by "half-life" and not "full-life"?
- In 1816 a huge volcanic eruption caused worldwide average temperatures to drop between 1-3 degrees. This had devastating effects. If a similar eruption happened now, would the effects be so bad, or would the fact we have heated the planet mean some of the effects were neutral, or even positive?
- What happens to meteorites that land on earth? Do they get taken by an organization or does whoever finds it get to keep it? Is there laws about things that fall from space?
- How are we testing COVID-19 Vaccine Longevity?
- Why do we feel pain near our chest region when we are emotionally hurt?
- How much does it cost to do a whole genome sequencing of SARS-CoV-2?
- Why is there no Tornado Alley in China?
- What would it be like to dig a ditch by hand shoveling on Mars? Would it be easier or more difficult than on Earth?
- Why are children less susceptible to serious illness with Covid-19?
- How much was the world actually cooled during the "Year Without a Summer?"
- Do cravings for specific nutrients get stronger when we are deficient in them?
- Why do you have to lick your lips before you whistle?
- Do glaciers and icebergs melting noticably change the pH of the ocean?
- David Attenborough has just told me that bees can see colours which humans can’t (Life in Colour on Netflix). Before my brain explodes, can someone explain how this is possible, how we can know this, and what the colours might look like?
- Does the Coastline Paradox actually apply to reality?
- Do all planets have a "day-axis" that is relatively parallel to their "year-axis", or do some roll around their orbits like rolling balls for example?
- What happens to the mRNA that does not enter a cell?
- It's been a year since covid became "pandemic". What progress have we made in treatments for it, is there something doctors can do?
| Posted: 18 Mar 2021 04:00 AM PDT Hi Reddit! I'm a Senior Fellow of the Woods Institute for the Environment and of the Precourt Institute for Energy. I have published three textbooks and over 160 peer-reviewed journal articles. I've also served on an advisory committee to the U.S. Secretary of Energy and cofounded The Solutions Project. My research formed the scientific basis of the Green New Deal and has resulted in laws to transition electricity to 100% renewables in numerous cities, states, and countries. Before that, I found that black carbon may be the second-leading cause of global warming after CO2. I am here to discuss these and other topics covered in my new book, "100% Clean, Renewable Energy and Storage for Everything," published by Cambridge University Press. Ask me anything about:
I'll be here, from 12-2 PM PDT / 3-5 PM EDT (19-21 UT) on March 18th, Ask Me Anything! Username: /u/Mark_Jacobson [link] [comments]  |
| In a crystal, how do electrons and holes move? Posted: 18 Mar 2021 07:12 AM PDT In a crystal, electrons are delocalized over many unit cells. I'm not sure how something can move or diffuse, if it is already delocalized and contains probability amplitude at many different locations? Also, what causes movement or diffusion through the lattice? If each unit cell is equivalent, the potential energy should be spatially periodic and not changing in time - why would an electron move? [link] [comments]  |
| Why do we measure medication times by "half-life" and not "full-life"? Posted: 18 Mar 2021 06:38 AM PDT It's seems weird to me we talk about medication half-lives but wouldn't it make more sense to talk about the full-life of a medication? Seems to make more sense to talk about when the medication fully leaves your system and then you can just divide that in half to get the half-life. [link] [comments]  |
| Posted: 17 Mar 2021 05:35 PM PDT |
| Posted: 17 Mar 2021 04:34 PM PDT |
| How are we testing COVID-19 Vaccine Longevity? Posted: 17 Mar 2021 07:28 PM PDT If we don't know how long the vaccine lasts, I think it would be likely that we end up giving it to people every year like the flu vaccine to be safe, even if the immunity is something like five years. However, to truly test the limits of immunity, do trials prevent certain people who volunteer from getting another shot (even though we hypothetically now give it out every year) for a given amount of time? How did we do it with Tetanus? That's a 10 year shot. Did we just not let someone get a tetanus shot for 10 years to figure that out? Hopefully I'm being clear. Thanks! [link] [comments]  |
| Why do we feel pain near our chest region when we are emotionally hurt? Posted: 17 Mar 2021 09:00 AM PDT |
| How much does it cost to do a whole genome sequencing of SARS-CoV-2? Posted: 17 Mar 2021 04:50 PM PDT In New Zealand we do whole genome sequencing on all the positive cases we get. I was wondering how much does it cost, roughly, to do one of these tests? I found a paper with the detailed information on how the test is done
[link] [comments]  |
| Why is there no Tornado Alley in China? Posted: 17 Mar 2021 09:12 AM PDT I don't know much about Tornados, but as I understand it, Cold Dry air mixing with Warm Wet air is how you get tornados. So in the US, there's warm wet air from the gulf colliding with cold dry air from Canada and we get "Tornado Alley" where most tornadoes happen. I know there are tornados in China, but no "Tornado Alley" phenomenon. It looks like there should be the same happening somewhere- warm, wet air from the South China Sea colliding with cold, dry air from Mongolia/Russia. What is this system missing that it needs to produce more tornados? [link] [comments]  |
| Posted: 17 Mar 2021 04:28 PM PDT |
| Why are children less susceptible to serious illness with Covid-19? Posted: 17 Mar 2021 02:51 PM PDT I searched the sub but found no similar question, and internet results are all over the map. I read many opinions such as "because of their recent immunizations", "they have greater inherent protection against coronavirus due to being common harbingers for the common cold", and even "their immune systems are stronger. " Do we have any good idea yet why they seem to fare better or is it just too early to know? Particularly when they ARE susceptible to the flu in greater numbers, and flu has a similar angle of attack. [link] [comments]  |
| How much was the world actually cooled during the "Year Without a Summer?" Posted: 17 Mar 2021 06:49 PM PDT So the year without a summer resulted in temperatures plummeting, with the year reportedly going without a summer, hence the name, with the global temperature being lowered by 3 degrees C or 5.4 degrees F. Reportedly, snow fell in summer in New England. Source. Now while the average global temperature fell that much, I find it hard to believe that it was that uniform, considering daily lows in the mountainous parts of new england are still a good 20 degrees F above freezing, so snow would simply not be possible at all all over new england if it was that uniform. So how were temperatures actually affected worldwide, and what could we expect from a Tambora size eruption today? [link] [comments]  |
| Do cravings for specific nutrients get stronger when we are deficient in them? Posted: 17 Mar 2021 06:31 AM PDT For example protein has a taste we can crave - umami. Many vitamin-packed stuff tastes sour or bitter. Sugar can be craved - but is it really a common craving when blood sugar drops? [link] [comments]  |
| Why do you have to lick your lips before you whistle? Posted: 17 Mar 2021 10:22 PM PDT |
| Do glaciers and icebergs melting noticably change the pH of the ocean? Posted: 17 Mar 2021 11:11 AM PDT Hello Due to climate change the polar ice caps are melting. When the icebergs or glaciers melt since they are fresh water they would theoretically dilute the ocean right? Would this have a noticeable affect on the pH of the ocean? And would this cause any noticeable change in the environment around them? Or globally? Thank you [link] [comments]  |
| Posted: 17 Mar 2021 03:43 PM PDT |
| Does the Coastline Paradox actually apply to reality? Posted: 17 Mar 2021 09:03 PM PDT The idea that measuring a coastline with finer and finer units of measurement only makes it longer confuses me. I understand the idea when considering the kilometer -> meter - > centimeter conversion, as detail emerges with each new unit, but wouldn't you start getting diminishing returns after using a measurement smaller than a grain of sand? Even if that's not the case, I'm almost certain using a unit smaller than an atom would give an absolute length of a coastline, as there wouldn't be any more detail to uncover. I could just be bringing a thought experiment out of a vacuum and into reality, but I find it weird that it's called the Coastline Paradox rather than the Fractal Paradox if it can't actually be considered an unsolvable paradox when applied to coastlines. I would really appreciate everyone's thoughts on this, thanks! [link] [comments]  |
| Posted: 17 Mar 2021 07:20 AM PDT |
| What happens to the mRNA that does not enter a cell? Posted: 17 Mar 2021 07:32 AM PDT I think I understand the basics of how the mRNA coronavirus vaccines work once they enter a cell. But I'm curious what happens to the mRNA (and its surrounding lipid) that's doesn't enter a cell. Is it "garbage collected" somehow? Does it not matter? Sorry, I think I forgot my basic biology, but I find these mRNA vaccines fascinating! Any help or point in the right direction would be much appreciated! [link] [comments]  |
| Posted: 17 Mar 2021 09:30 AM PDT |
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