- AskScience AMA Series: I am Jonathan Berman, author of the forthcoming "Antivaxxers: How To Challenge A Misinformed Movement" from MIT press, former co-chair of the March for Science, and a renal physiologist, AMA!
- Are we born with the cells of the adaptive immune system?
- How can it use less energy to fling something out of the solar system, rather than dumping it into the sun?
- How moving parts are lubricated in curiosity rover on Mars over these years? If not what technology is used to ensure longer life?
- Can people in the Southern Hemisphere see the Milky Way?
- If photons don't have mass, why does it have momentum?
- Delta-V to Earth-Moon L2 greater than Earth-Moon L1, why? Delta-Vs for travel to L3, L4, and L5?
- Is there enough data to indicate COVID-19 transmission rates among children?
- What is the technical term for when a substance is so energetic that it emits light? An example would be fresh lava.
- Do dogs socialize differently with other members of their own breed than with others, or is all dog socializing the same regardless of breed?
- What changes when you change the intensity of visible light?
- If negative pressure (cosmological constant) expands space, does positive pressure (normal matter) contract it?
- How can biological systems count time? E.g. what triggers the production of hormones to induce puberty?
- Can someone explain to me how the type-5 and type-26 adenovirus vaccines work to fight covid?
- We know that in higher altitudes boiling point decreases, we also know that it takes more time to boil at higher altitudes. but wouldn't reaching a lower temperature require lower energy and therefore less time to boil?
- How does the cell separate exons from introns, and what enzime does the splicing?
- What is the evidence for wearing face masks to lower COVID-19 transmission?
- How do handheld police radar guns work while the operator is driving?
- How does streaming DRM work? (e.g. Netflix)
- What's the difference between chelation and precipitation?
- Do spiders use other spiders webs?
- Do your ears push earwax out naturally? If so how?
| Posted: 13 Jul 2020 04:01 AM PDT My name is Jonathan Berman and my book Antivaxxers: How to Challenge a Misinformed Movement is due out on September 8th. It is about the anti-vaccine movement and its historical antecedents, as well as what makes anti-vaxxers tick. I hosted the unveiling of the world's largest periodic table of the elements. I've worked as a rickshaw driver, wing cook, and assistant professor. At various points I've been a stand up comic, carpet remover, and radio host, but mostly a scientist. Verification on twitter. Ask me anything! Out guest will be joining us at 12 ET (16 UT). Username: bermanAMA2020 [link] [comments]  |
| Are we born with the cells of the adaptive immune system? Posted: 13 Jul 2020 05:35 AM PDT I'm learning about the immune system. Most sources say that the innate immune system protects us from the moment we are born. Those same sources say that the adaptive immune system must develop over time -- learn to recognize pathogens and produce antibodies against them. But my understanding is that we are born with all the cells of the adaptive immune system, but they are naive (they've never seen a pathogen), so while they are circulating in our bodies and tissues from birth, these cells still need be exposed to unique pathogens so that they can mount a specific defense against them. Do I have that right? Are the cells of the adaptive immune system present in our bodies from birth, but they are a just naive? More specifically, are we born with millions of B cells, each with a membrane-bound antibody that only become activated when they encounter and bind to their cognate antigens? (Edit: clarity of question and typos) [link] [comments]  |
| Posted: 13 Jul 2020 04:11 AM PDT Wouldn't you just have to point it at the sun and let gravity do the work? [link] [comments]  |
| Posted: 12 Jul 2020 08:52 AM PDT |
| Can people in the Southern Hemisphere see the Milky Way? Posted: 12 Jul 2020 07:32 PM PDT |
| If photons don't have mass, why does it have momentum? Posted: 13 Jul 2020 03:00 AM PDT |
| Delta-V to Earth-Moon L2 greater than Earth-Moon L1, why? Delta-Vs for travel to L3, L4, and L5? Posted: 12 Jul 2020 02:56 PM PDT Hi askscience! I was looking at this lovely Delta-V figure put together b /u/CuriousMetaphor: If you look at the Earth-Moon System conveyed in the top-center of the figure, you will notice that the Delta-V from Earth-Moon Transfer to L2 is 0.35, while the transfer to L1 is 0.58. This seems counter-intuitive to me, since L1 is in between the earth and the moon, while L2 is on the opposite side of the moon. Why would it be a "cheaper" delta-v budget to go to L2 rather than L1? What would be the relative delta-v values for travel to the L3, L4, and L5 points? Thanks for the information! I look forward to hearing from you soon! For curious folks who aren't familiar with Lagrange Points, here is the wikipedia article to explain them and show you their space-ial (ha) locations. Thanks again everyone! [link] [comments]  |
| Is there enough data to indicate COVID-19 transmission rates among children? Posted: 12 Jul 2020 05:01 PM PDT Some of the evidence supporting low transmission rates among children seem to refer to individual cases, such as a child being infected at a school, but not spreading it to other students. Other studies seem to rely on contact tracing finding that the majority of COVID infections in children are spread adult to child. However, would these findings not be skewed by the fact that children, not currently being in school, are less likely to come into contact with other children who have COVID? In that case, would adults not be the most probable source for a child to contract COVID? The article I am referring to here is COVID-19 Transmission and Children: The Child Is Not to Blame. All this to ask, is there enough evidence to support low COVID-19 transmission rates among children? Sorry for my ignorance. It is very possible that I have misinterpreted the article. I am sure there are other articles that would be beneficial for me to read as well. If anyone has information on the topic, I would greatly appreciate the opportunity to learn more. [link] [comments]  |
| Posted: 13 Jul 2020 01:13 AM PDT More specifically, what is the term for the glow itself? My google-fu was weak on this one. [link] [comments]  |
| Posted: 12 Jul 2020 07:15 AM PDT |
| What changes when you change the intensity of visible light? Posted: 13 Jul 2020 12:35 AM PDT I understand that increasing the intensity increases the speed that the photons leave the surface from where the light is emitted, but what property/ies of light do you change to make the light have a higher energy while still maintaining the frequency? [link] [comments]  |
| Posted: 12 Jul 2020 10:37 AM PDT I always found this so hard to grasp. The expansion of the universe is always described just as that, an expansion of space, but I have never heard of anyone speaking of normal gravitation as a "contraction" of space. Is it not the same thing or am I failing to grasp something more basic? [link] [comments]  |
| Posted: 12 Jul 2020 07:05 AM PDT Certainly the age of puberty in some sense is not highly specific. There can be years of difference for individuals. But most people don't start puberty at say age 6 or age 20. But even in such extreme cases I wonder what was the step from "don't induce it now" to "induce it now". [link] [comments]  |
| Can someone explain to me how the type-5 and type-26 adenovirus vaccines work to fight covid? Posted: 13 Jul 2020 03:06 AM PDT |
| Posted: 12 Jul 2020 07:20 PM PDT |
| How does the cell separate exons from introns, and what enzime does the splicing? Posted: 12 Jul 2020 08:30 AM PDT |
| What is the evidence for wearing face masks to lower COVID-19 transmission? Posted: 12 Jul 2020 07:48 AM PDT I hear a lot of people saying "oh this is fine because everyone was wearing masks" or "they weren't wearing masks, that's why X happened". I understand the mechanistic evidence for decreased transmission, but is there actual scientific evidence? I worry that masks are being cited as major factor in transmission and I'm just unsure of the evidence, especially distinguishing mask wearing versus other social distancing behaviors [link] [comments]  |
| How do handheld police radar guns work while the operator is driving? Posted: 12 Jul 2020 09:13 AM PDT I'm assuming they need to be synced with sensors on the patrol car and add the relative velocity between the patrol car and the target car to compute the actual speed of the target car? Also, some guy on Youtube was saying that you could aim a standalone radar gun at the interior of your own car and somehow measure your own speed using the Doppler effect. There's no way you could do this without directly measuring your relative velocity with the road, right? [link] [comments]  |
| How does streaming DRM work? (e.g. Netflix) Posted: 12 Jul 2020 08:33 AM PDT I'm wondering how Netflix (and others) protect their content, from an academic standpoint. I understand that the video stream is encrypted (AES, IIUC), but the client must have the key to decrypt it and play the video, and it's not clear to me how this can be done securely. If the OS has access to the key, then it surely can be extracted, right? Even if the code is obfuscated, decrypting AES follows some pretty recognizable CPU instructions, and one could theoretically add breakpoints on these and get the key. How is this prevented in practice? Presumably, I could also capture the HDMI output and keep the video content that way, right? [link] [comments]  |
| What's the difference between chelation and precipitation? Posted: 12 Jul 2020 05:24 AM PDT I've recently learned about chelation, and while going through the definition it seems awfully similar to precipitation (both take solute out of solution). From what I've seen, the difference is mainly in how it's taken out - chelation seems to be something about multiple bonding sites and metals, but it's not super clear to me since precipitation at the core seems to be the same thing, at least in result. Is classification the only difference? Is there some difference in terms of the actual bonds being formed? [link] [comments]  |
| Do spiders use other spiders webs? Posted: 11 Jul 2020 10:13 PM PDT What happens to all the spider webs left behind by now deceased spiders? Do new fresh spiders use those webs as highways? [link] [comments]  |
| Do your ears push earwax out naturally? If so how? Posted: 12 Jul 2020 12:17 AM PDT |
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