- AskScience AMA Series: I am a forensic anthropologist at the University of Florida who will be excavating for human remains in Tulsa, Oklahoma during the 100th anniversary of the Tulsa Race Massacre. AMA!
- How long does it take to create a marine arch, like Darwin's Arch, and how long do they last?
- Since time is not absolute, does it make sense to describe the age of far away galaxies in years?
- When we say space is flat does this mean it's any less infinite in one direction?
- Is there a name to this kind of operation ? (25 -> 2+5 = 7)
- If speed is distance travelled over time, what does it mean to say that everything moves through spacetime at the speed of light? How do distance and time work in this context, since they define speed?
- Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
- What is the common component across the autism spectrum that groups the disorder under a single name?
- When did we discover that there's a Supervolcano under Yellowstone?
- If electrons are not made up of quarks, why do they form neutrons when pushed into protons in a neutron star? Where do the extra down quarks come from?
- What proportion of a rocket's fuel/energy is spent getting to orbit height vs orbit speed?
- If the coal left behind when a fire burns is carbon, why doesn't it too combine with oxygen?
- Why it is very hard to treat viral diseases with medicines ?
- Can the efficacy of a vaccine be affected by a longer time between doses?
- Why does liquid get cooler when you blow on it?
- What (if any) are the benefits of using premium gas vs regular gas?
- Can covid-19 be caught by touching a contaminated surface ?
- What happens if someone takes 2 doses of 2 different COVID vaccines?
- How is a Quartz Crystal both transparent and piezoelectric?
- If the CMB is red shifted, is it still red shifting?
- Why do periodical cicada broods contain several species?
- Why is water most dense at +4 degrees Celsius?
| Posted: 19 May 2021 04:00 AM PDT Hi Reddit, my name is Phoebe Stubblefield! I am a forensic anthropologist, a research assistant scientist and interim director of the C. A. Pound Human Identification Lab at the University of Florida. During the centennial of the Tulsa Race Massacre, I will continue to excavate with the Physical Investigation Team at the Oaklawn Cemetery in Tulsa, Oklahoma to identify victims from the violence in 1921. I'm here to answer your questions about the intersection of cultural anthropology with forensic sciences and our work in uncovering some of the history behind the Tulsa Race Massacre, a devastating attack on what was once known as Tulsa's thriving Black Community. My research interests at the University of Florida are:
More about me: In 2002, I received my Ph.D. in Anthropology from the University of Florida where I was the last graduate student of Dr. William R. Maples, founder of the C.A. Pound Human ID Lab. As an associate professor at the University of North Dakota for 12 years, I directed the Forensic Science Program, created a trace evidence teaching laboratory and helped undergraduate students learn more about careers in forensic science. I have also served as forensic consultant for the North Dakota State Historical Society, the North Dakota Bureau of Criminal Investigation, the Minnesota Bureau of Criminal Apprehension and with different medical examiner districts throughout Florida.
I will be on at 2p.m. ET (18 UT) to answer your questions, AMA! Username: /u/UFExplore [link] [comments]  |
| How long does it take to create a marine arch, like Darwin's Arch, and how long do they last? Posted: 18 May 2021 07:46 PM PDT On May 18th we heard the sad news that Darwin's Arch, a 500-foot tall formation in the pacific had collapsed. This event seemed reminiscent of the collapse of another great marine arch, The Arch of Kerguelen roughly 100 years ago. That remote island arch was apparently over 1000 feet tall and, like the Darwin Arch, is now just a set of majestic pillars. Were we humans just lucky to have been able to witness these formations? How long do they take to form? (It must be more than 100 years suggesting that the majestic arch collapse rate is higher than the creation rate -- at least in the short term). How long can they last? [link] [comments]  |
| Since time is not absolute, does it make sense to describe the age of far away galaxies in years? Posted: 19 May 2021 12:45 AM PDT |
| When we say space is flat does this mean it's any less infinite in one direction? Posted: 18 May 2021 07:57 PM PDT I'm trying to learn about the curvature of space so I've been reading about how it's probably flat rather than hyperbolic or spherical. But when I think of the word flat my brain just kind of intuitively tells me less dimensions. Would picturing the observable universe as sphere-ish but without borders, like to infinity, in every direction be incorrect? Does this even have anything to do with the curvature of space? Sorry, no formal education in the field just someone quietly trying to learn and confused. Thanks for any help in understanding this! [link] [comments]  |
| Is there a name to this kind of operation ? (25 -> 2+5 = 7) Posted: 19 May 2021 01:34 AM PDT Hello everyone ! I'm quite new to this subreddit and I had a question for you mathematicians out there: Does the operation of adding up every digit in a number have a specific name ? And does it links to a branch of mathematics in some way? This is the kind of operation I had in mind: 236 -> 2+3+6 = 11-> 1+1 = 2 [link] [comments]  |
| Posted: 19 May 2021 03:45 AM PDT |
| Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 19 May 2021 07:00 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology 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]  |
| Posted: 18 May 2021 10:35 AM PDT Effects can rage from causing difficulty in social settings to being completely debilitating. Why do we group these effects by the same name? To me, it seems like the autism spectrum is so broad that it hardly means anything. And doesn't it cause unnecessary confusion for doctors? Thanks! I'm sorry if some of my wording was insensitive. [link] [comments]  |
| When did we discover that there's a Supervolcano under Yellowstone? Posted: 18 May 2021 10:21 PM PDT I'm writing a bit of alternate history and I can't find an answer to this question. Everywhere I've easily looked at just talks about when previous eruptions happened and such but I want to know when scientists discovered the Supervolcano under Yellowstone. [link] [comments]  |
| Posted: 19 May 2021 01:45 AM PDT |
| What proportion of a rocket's fuel/energy is spent getting to orbit height vs orbit speed? Posted: 18 May 2021 02:09 PM PDT Let's assume low earth orbit and a cargo along the lines of crew dragon. [link] [comments]  |
| If the coal left behind when a fire burns is carbon, why doesn't it too combine with oxygen? Posted: 18 May 2021 10:43 PM PDT I understand that the ash left behind after a wood fire is carbon. But what I know about chemistry suggests that the carbon would also combine with the oxygen to make CO2? Obviously I'm missing something here. [link] [comments]  |
| Why it is very hard to treat viral diseases with medicines ? Posted: 18 May 2021 09:42 PM PDT |
| Can the efficacy of a vaccine be affected by a longer time between doses? Posted: 18 May 2021 05:06 PM PDT Sorry if this isn't allowed here, the mods can remove it if that's the case. I don't think this quite falls under rule 1 and I've seen a few questions pertaining to vaccines here. With that out of the way, my question is this: Would one be less protected if they took the 2nd dose of a COVID-19 vaccine way after the recommended time? (21 days for Pfizer, 28 days for Moderna and Astrazeneca) Where I live, there's an 4 month interval between doses which is a lot longer than the recommended wait time. If I'd be less protected because of this policy, then I honestly might wait until the single dose J&J is offered so my protection isn't compromised. I'm sure it varies from vaccine to vaccine, but right now Pfizer and Moderna are being offered so any information about that would be appreciated. [link] [comments]  |
| Why does liquid get cooler when you blow on it? Posted: 19 May 2021 12:27 AM PDT I read that it is because by blowing on it you increase the speed of evaporation. But how does a few extra molecules leaving the liquid provide with so much loss of heat? I would be curious of the numbers involved. [link] [comments]  |
| What (if any) are the benefits of using premium gas vs regular gas? Posted: 18 May 2021 11:00 AM PDT If a vehicle is meant to use regular gasoline, what (if any) benefits would purchasing premium gasoline have? [link] [comments]  |
| Can covid-19 be caught by touching a contaminated surface ? Posted: 18 May 2021 12:38 PM PDT Hello. Covid-19 has been around for more than a year now. In the early months of the pandemic health organizations emphasized on washing hands, disinfecting surfaces, wearing a mask. This has since shifted towards enforcing social distancing and wearing a mask. Do we now have enough scientific data to accurately know how hard/easy it is to get infected by touching a contaminated surface ? Say for example an infected coughs on a metal door handle. How long would the virus survive there ? If another person touches that same handle, what are the risks of getting infected ? Is it guaranteed to get infected if they would lick their finger or rub their eyes ? Does it get back to zero risk if they thoroughly wash their hands with soap afterwards ? I've looked online but found wildly different answers from website to website. Thank you. [link] [comments]  |
| What happens if someone takes 2 doses of 2 different COVID vaccines? Posted: 18 May 2021 03:08 PM PDT For example if someone is in a country where Pfizer vaccine is offered but then moves somewhere where only AstraZenica or Sinopharm vaccines are offered after taking their first dose of the Pfizer vaccine. What is he or she supposed to do? Restart and take 2 doses of whatever available vaccine? Or take just the second dose regardless of the vaccine type? Not necessarily the specific vaccines I mentioned, I am asking about combinations in general. [link] [comments]  |
| How is a Quartz Crystal both transparent and piezoelectric? Posted: 18 May 2021 12:02 PM PDT As many of you will know, quartz crystals have a unique ability to produce an electrical reaction when pressure, heat or a charge is applied. This phenomenon is referred to as piezoelectric. This is the basis for how quartz watches work and is why these watches are both very inexpensive and accurate. I was wondering though, why quartz crystals are also commonly transparent. My understanding was that transparent materials are typical good insulators because they do not have available electrons to readily interacts with photons or transmit electrical charges. Conversely, this is why metals are not ever transparent. Can someone help me understand the nature of a quartz Crystal (or any similar material) and its special ability to produce electricity, while also having a minimal interaction with light? Is the idea that when heat or pressure is applied to the quartz Crystal, the otherwise stable electrons are forced out of position? Does this temporarily change the crystals opacity? Thank you [link] [comments]  |
| If the CMB is red shifted, is it still red shifting? Posted: 18 May 2021 10:49 AM PDT If the CMB is red shifted from what used to be infrared and visible light, now shifted to microwave wave lengths, will there be a time where it red shifts so much, that it becomes the cosmic radio background? or the cosmic long-wave background? If so, how long would that be, and how would we calculate how long it would take? [link] [comments]  |
| Why do periodical cicada broods contain several species? Posted: 18 May 2021 10:53 AM PDT Do they benefit from this in some way? Is there a risk of hybridization? [link] [comments]  |
| Why is water most dense at +4 degrees Celsius? Posted: 18 May 2021 07:06 AM PDT |
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