Did Neanderthals make the cave paintings ? |
- Did Neanderthals make the cave paintings ?
- AskScience AMA Series: We have hints of life on Venus. Ask Us Anything!
- Why isn't the rabies virus extinct, since the carrier dies so quickly after the clinical symptoms?
- How can we know the 'long term' effects of COVID-19 if we have not had it for a long period yet?
- Is it possible for a species to have an evolutionary trait that wasn't a result of survival of the fittest? Essentially just a trait that tagged along for the ride as the generations went on?
- Is there a correlation between 1 cal = 4.184 J and water’s heat capacity of 4.184 J/g°C?
- How if you jump inside a train you land in the same spot but when your on top of a train you land in a different spot?
- How are chip manufacturers getting around quantum tunneling in the manufacturing of smaller than 7nm sized chips?
- Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
- If you are in a 300 AQI area for 5 hours vs a 150 AQI area for 10 hours, are they the same level of harm?
- Do vaccines apply environmental pressures creating more robust viruses?
- The moon has such a gravitational effect on tides, why aren't the leaves on plants pulled upwards at night? or are they?
- Given Cherenkov radiation, is there a possibility that cause and effect can be reversed?
- Is drift velocity of electrons constant for a given conductor at a particular temperature?
- What does this answer for the integration of sqrt{1+x^3} mean?
- How would the damage of dropping Everest as if it werea bomb compare to nukes?
- What happens to mosquitos in winter?
- Which MHC Class Presents Intracellular Bacteria?
| Did Neanderthals make the cave paintings ? Posted: 15 Sep 2020 06:53 PM PDT In 2018, Dirk Hoffmann et al. published a Uranium-Thorium dating of cave art in three caves in Spain, claiming the paintings are 65k years old. This predates modern humans that arrived in europe somewhere at 40k years ago, making this the first solid evidence of Neanderthal symbolism. Paper DOI. Widely covered, EurekAlert link This of course was not universally well received. Latest critique of this: 2020, team led by Randall White responds, by questioning dating methodology. Still no archaeological evidence that Neanderthals created Iberian cave art. DOI. Covered in ScienceNews Hoffmann responds to above ( and not for the first time ) Response to White et al.'s reply: 'Still no archaeological evidence that Neanderthals created Iberian cave art' DOI Earlier responses to various critiques, 2018 to Slimak et al. and 2019 to Aubert et al. 2020, Edwige Pons-Branchu et al. questining the U-Th dating, and proposing a more robust framework DOI U-series dating at Nerja cave reveal open system. Questioning the Neanderthal origin of Spanish rock art covered in EurekAlert Needless to say, this seems quite controversial and far from settled. The tone in the critique and response letters is quite scathing in places, this whole thing seems to have ruffled quite a few feathers. What are the takes on this ? Are the dating methods unreliable and these paintings were indeed made more recently ? Are there any strong reasons to doubt that Neanderthals indeed painted these things ? Note that this all is in the recent evidence of Neanderthals being able to make fire, being able to create and use adhesives from birch tar, and make strings. There might be case to be made for Neanderthals being far smarter than they've been usually credited with. [link] [comments]  |
| AskScience AMA Series: We have hints of life on Venus. Ask Us Anything! Posted: 16 Sep 2020 04:00 AM PDT An international team of astronomers, including researchers from the UK, US and Japan, has found a rare molecule - phosphine - in the clouds of Venus. On Earth, this gas is only made industrially or by microbes that thrive in oxygen-free environments. Astronomers have speculated for decades that high clouds on Venus could offer a home for microbes - floating free of the scorching surface but needing to tolerate very high acidity. The detection of phosphine could point to such extra-terrestrial "aerial" life as astronomers have ruled out all other known natural mechanisms for its origin. Signs of phosphine were first spotted in observations from the James Clerk Maxwell Telescope (JCMT), operated by the East Asian Observatory, in Hawai'i. Astronomers then confirmed the discovery using the more-sensitive Atacama Large Millimeter/submillimeter Array (ALMA), in which the European Southern Observatory (ESO) is a partner. Both facilities observed Venus at a wavelength of about 1 millimetre, much longer than the human eye can see - only telescopes at high altitude can detect it effectively. Details on the discovery can be read here: https://www.eso.org/public/news/eso2015/ We are a group of researchers who have been involved in this result and experts from the facilities used for this discovery. We will be available on Wednesday, 16 September, starting with 16:00 UTC, 18:00 CEST (Central European Summer Time), 12:00 EDT (Eastern Daylight Time). Ask Us Anything! Guests:
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| Why isn't the rabies virus extinct, since the carrier dies so quickly after the clinical symptoms? Posted: 16 Sep 2020 05:59 AM PDT |
| How can we know the 'long term' effects of COVID-19 if we have not had it for a long period yet? Posted: 16 Sep 2020 03:27 AM PDT |
| Posted: 16 Sep 2020 04:47 AM PDT |
| Is there a correlation between 1 cal = 4.184 J and water’s heat capacity of 4.184 J/g°C? Posted: 15 Sep 2020 02:20 PM PDT I'm in an online introduction class to chemistry. Today's lesson covered energy, temperature, heat capacity and such. There was one part of the lesson that said 1 calorie is equal 4.184 joules. Later in the lesson there was a part that said water's heat capacity is 4.184 J/g°C. I noticed that numbers were the same between the two. No where in the lesson did it address this similarity. So I was wondering if there's a reason that these numbers are the same or if some there is some kind of correlation out side of having joule as part of the measurement? Or is this just coincidence? [link] [comments]  |
| Posted: 16 Sep 2020 02:04 AM PDT |
| Posted: 15 Sep 2020 03:09 PM PDT So we all know that quantum tunneling was going to be an issue down at the smallest transistor size levels, where 7nm was claimed to be the absolute limit. But now I'm seeing 7nm processes everywhere in my phone, in the CPU I'm using in my machine, and from what I'm reading Samsung and TSMC have manufactured 5nm process chips and are planning manufacturing of 3nm chips (the next size down). How are they getting around QT and how does this affect what is seen on screen? [link] [comments]  |
| Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 16 Sep 2020 08:08 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary 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]  |
| Posted: 15 Sep 2020 07:13 PM PDT Mathematically, it makes sense that you'd be breathing in the same amount of particles given the two periods of time. I was wondering if this was similar to how the liver functions when responding to alcohol. (There is less harm done if you were to drink 1 beer for a month vs if you drank a months worth of beer in 1 day.) [link] [comments]  |
| Do vaccines apply environmental pressures creating more robust viruses? Posted: 15 Sep 2020 09:34 PM PDT Please forgive the obviously contentious question. It's not my goal in the least to give those that would deny science ammunition. I've been a member here for better than a decade, with this account going back four years. My history is there for any to view, I'm not an instigator, I'm not a shill, I'm not a science denier. On the contrary I'd like to consider myself to be highly critical and objective in most things. I ask this question with a legitimate curioursity, and there is a level of concern I feel regarding Covid because of it. Sorry for the long preamble, but I'd really like this question to have an opportunity to be answered by someone with expert knowledge and objective perspective. I would ask that those that do not know please refrain from speculating. I don't want this to devolve into a game of hearsay and finger pointing. It's my understanding that the medical community in particular have been facing a troubling trend over the past decade or so. That of highly resistant strains of bacteria. MRSA. I've been led to believe that the cause of this is the over prescription of antibiotics and the bacteria's direct evolutionary response in overcoming these methods of defense. Is it appropriate to talk about viruses in the same manner? I understand they will also go through stages of rapid mutation and that environmental pressures, including vaccines, create a survival of the fittest arena, in which those that continue to survive and procreate naturally evolve to become more resistant and or more virulent. Is that a fair assessment? Is there objective evidence that shows how influenza has reacted to the past 50 years of vaccination? If so, has it created a more robust virus because of it? If that is also the case, should we have concerns about introducing a vaccination for Covid that could have the unintended consequences of creating a more robust virus in the same way? Again, I apologize for the inflammatory question. It is however a legitimate question. I'm not a troll, and I have the history to show that. I'm not an anti-vaxxer or science denier. I just think that if my understanding, which I will freely admit could be entirely inaccurate, holds true; These are concerning questions. Thank for any time or consideration, and again, I politely and with the utmost respect to everyone in this community ask that if you do not have objective evidence to back your answers, please refrain from speculation. [link] [comments]  |
| Posted: 16 Sep 2020 04:54 AM PDT i noticed my fig tree's leaves seem to be pulled upwards some in the middle of the night and i wondered about this question. edit: although they might just be new leaves that haven't grown in fully yet. [link] [comments]  |
| Given Cherenkov radiation, is there a possibility that cause and effect can be reversed? Posted: 16 Sep 2020 12:15 AM PDT Please bear with me and my rough understanding. Light carries the information that something happened and its effects into the future. The common wisdom states that if something travels faster than the speed of light, it's effectively travelling into the past. So this (and only this /s) is the reason that things can't travel faster than the speed of light in a vacuum. However, given that the speed of light in a non vacuum medium can be exceeded by other particles in the right conditions, would it be right to say that these particles are traveling to the past and hence reversing cause and effect behaviours? [link] [comments]  |
| Is drift velocity of electrons constant for a given conductor at a particular temperature? Posted: 15 Sep 2020 08:23 AM PDT |
| What does this answer for the integration of sqrt{1+x^3} mean? Posted: 16 Sep 2020 01:48 AM PDT So I'm using the sympy library in Python, and I wanted to see the result for the integration of sqrt{1+x^3}. The answer I got was this . I only recognize the Gamma Function notation in this expression, but I don't know how I can evaluate this. What does the F_1( ) represent? Some observations: I tried using limits as (0,3) in this integral, and got a real valued answer . The intergration for sqrt{1+x^k} is this, which is pretty neat! [link] [comments]  |
| How would the damage of dropping Everest as if it werea bomb compare to nukes? Posted: 15 Sep 2020 11:44 PM PDT |
| What happens to mosquitos in winter? Posted: 15 Sep 2020 08:48 AM PDT First off, I hate mosquitos! But what happens to them when it's cold and the bugs are mostly gone? Do they just hibernate or something like that? [link] [comments]  |
| Which MHC Class Presents Intracellular Bacteria? Posted: 15 Sep 2020 04:35 PM PDT I understand that MHC Class I displays intracellular peptides broken down and MHC Class II presents broken down extracellular components. However, it seems like intracellular bacteria (i.e. M.Tuberculosis) falls in the middle. Which MHC Class is responsible for these? Thank you! [link] [comments]  |
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