AskScience AMA Series: I'm Athena Aktipis, professor and author of The Cheating Cell: How Evolution Helps Us Understand and Treat Cancer, ask me anything! |
- AskScience AMA Series: I'm Athena Aktipis, professor and author of The Cheating Cell: How Evolution Helps Us Understand and Treat Cancer, ask me anything!
- Why do we only see one big rainbow instead of myriad of very small ones? Every drop of water in the air kind of creates its own small rainbow by refracting the light, so why don't we see all of those individually?
- Do tendons get thicker aswell with strength training?
- Can Covid cause serious problems to those with Crohn's disease?
- Could Earth have been a collection of Ireland sized islands scattered all over (same total land sq km) vs the giant landmasses we see today? How different would humanity be?
- Does the adenovirus "package" of the Astra-Zeneca vaccine cause the side-effects?
- How long do the effects of the Tetanus vaccine /Tetanus anti toxin last?
- Is there a theoretical limit to how quickly we can increase a liquid to a boiling point?
- Would you be able to tell the difference in weightlessness in orbit and in deep space?
- Why are laser beams on laser cutters machines focused to a point and not refocused back at that point so that the laser is then constantly at it's minimum width?
- On a ventilator, you can increase the respiratory rate to decrease body CO2, but this doesn't increase oxygen since CO2 diffuses more readily in the lungs. Why does CO2 diffuse faster than oxygen?
- [Physiology] Why does the SA node spontaneously depolarize at a faster rate than the AV node?
- What is the wrinkly tinfoil stuff on satellites and space ships? With all the precision and money required for space endeavors, why does it seem like this material is applied without measuring for area?
- Why COVID saliva tests often require an hour without drinking water prior to sampling?
- Does gasoline become pyrophoric?
- Why does mental illness start in late teens to early 20s?
- Is this definition valid in elementary Group Theory?
- How different is the sars-CoV2 spike protein from other things that bind to the ACE2 receptor on cells?
- Why is time squared in D=1/2gt^2?
- Are the proteins expressed by the different COVID vaccines exactly the same?
| Posted: 19 Mar 2021 04:01 AM PDT Hi, I'm Athena Aktipis, author of The Cheating Cell, a book about cancer as a breakdown of multicellular cooperation. If you would like a quick read, I summarize the main points in this Slate article. I'm a professor of Psychology at ASU where I direct the Interdisciplinary Cooperation Initiative and co-lead the Arizona Cancer Evolution Center. I am also a podcaster and livestream show producer. Ask me anything! I'll be here to answer your questions around 2:30 PM MDT (4:30 PM ET, 20:30 UT), ask me anything! Twitter: @AthenaAktipis Username: /u/AthenaAktipis [link] [comments]  |
| Posted: 19 Mar 2021 03:30 AM PDT |
| Do tendons get thicker aswell with strength training? Posted: 18 Mar 2021 08:30 AM PDT |
| Can Covid cause serious problems to those with Crohn's disease? Posted: 18 Mar 2021 04:09 PM PDT Hey all I was checking this table(http://s3-eu-west-1.amazonaws.com/files.crohnsandcolitis.org.uk/decision_tree.pdf) and I just want to understand if someone with Crohn's who uses Remicade would be in serious danger if she/he was infected with Covid. For example could inflammations be triggered? I hope my question isnt obscure. Thank you. [link] [comments]  |
| Posted: 19 Mar 2021 05:53 AM PDT |
| Does the adenovirus "package" of the Astra-Zeneca vaccine cause the side-effects? Posted: 18 Mar 2021 03:11 PM PDT Hi everyone, I was vaccinated against COVID today (yay!), and it got me thinking... I've read the vaccine is more or less "packaged" using an adenovirus, which tend to cause cold- and flu-like symptoms. Coincidentally, the Astra-Zeneca vaccine can also cause cold- and flu-like side effects. Are the two correlated? Would a different package mean that vaccine wouldn't cause those side effects? And if so, why would AZ/Oxford use that "package" rather than another more innocuous one? Related to this, could we use this processus to create a "multi-vaccine" where we package a COVID vaccine using the influenza virus and the immune system would learn to fight both? [link] [comments]  |
| How long do the effects of the Tetanus vaccine /Tetanus anti toxin last? Posted: 19 Mar 2021 02:59 AM PDT We are often asked to take a Tetanus shot when we injure ourselves. I was curious as to know how long the antibodies or the anti toxin last for in the body and when do we need to take them once again? [link] [comments]  |
| Is there a theoretical limit to how quickly we can increase a liquid to a boiling point? Posted: 18 Mar 2021 10:13 AM PDT I was just marveling over how much more quickly my new electric teapot heats my water over my old one, and it got me wondering about what the limits are in determining just how quickly one could heat e.g. 1 liter of a given liquid to its boiling point. Obviously things such as the liquid's current temperature and boiling point, means of energy transmission, and atmospheric conditions (to name 3 of infinite variables) would impose a rough range of possibilities as far as how long the process would take. Such a range would have a lowest possible time limit, and I guess my question more accurately stated would be what (if any) principles would keep me from getting a teapot powerful enough to turn my liter of room temperature water to a temperature more suitable for steeping? [link] [comments]  |
| Would you be able to tell the difference in weightlessness in orbit and in deep space? Posted: 18 Mar 2021 10:58 PM PDT |
| Posted: 18 Mar 2021 10:59 AM PDT Sorry If I didn't explain myself correctly. Here is my attempt at clarifying. Laser cutters have a lens that focuses the beam into a point that is supposed to be in the middle of the material being cut. See this Wikipedia diagram to get an idea. From what I've read and heard from people operating this machine is that the lens has to be tuned for different thicknesses, of course. But why can you not put another (concave?) lens right at the focus point so that the laser is now a straight beam and then it can cut way thicker materials? Is it because at that point even the clearest lenses would melt from how much energy is focused or is there something more? Thanks [link] [comments]  |
| Posted: 18 Mar 2021 07:04 AM PDT |
| [Physiology] Why does the SA node spontaneously depolarize at a faster rate than the AV node? Posted: 18 Mar 2021 03:40 PM PDT I have dug through Pubmed and a few physiology textbooks searching for an answer to this question, but so far no luck. I understand that both the SA node and AV node in the heart spontaneously depolarize thanks to "funny current" as well as T-type calcium channels. However, I do not understand why the rate of depolarization during phase 4 is faster for the SA node. Most sources I have found just say "it has a faster rate of depolarization, therefore it acts as the pacemaker," but do not provide an explanation of why the slope of phase 4 is steeper in the SA node when compared to the AV node. [link] [comments]  |
| Posted: 18 Mar 2021 07:31 AM PDT An example of the material is here on the James Webb Space telescope https://www.nasa.gov/feature/goddard/2021/nasa-s-james-webb-space-telescope-completes-final-functional-tests-to-prepare-for-launch [link] [comments]  |
| Why COVID saliva tests often require an hour without drinking water prior to sampling? Posted: 18 Mar 2021 03:26 PM PDT I can understand why food particles and beverage residues may be detrimental, but is there any evidence that a minute amount of water significantly affects sample quality? [link] [comments]  |
| Does gasoline become pyrophoric? Posted: 18 Mar 2021 05:25 AM PDT Oxygen decreases the ignition temperature of chemicals, so I was curious if in a pure oxygen environment does gasoline become pyrophoric? [link] [comments]  |
| Why does mental illness start in late teens to early 20s? Posted: 17 Mar 2021 11:45 PM PDT |
| Is this definition valid in elementary Group Theory? Posted: 18 Mar 2021 01:41 PM PDT I know that you can have a simple 1-Dimensional translation group (Frieze group) such that the only valid operation is translation. In this case a translation leaves you with the same pattern and this presumably goes on forever in either direction. (the letter R, for example, has no other symmetry) Given the pattern: The Cayley diagram is: Operationally, this is: What if this is finite instead, and the nodes are distinct from each other? Consider a simple finite state machine with states {S0,S1,S2,S3}, such that t is invertible, but this isn't modulo arithmetic, e ≠ t4 . I guess you could say t4 = t3 , although this has no physical meaning in my case. Is this a valid group? [link] [comments]  |
| Posted: 18 Mar 2021 08:45 AM PDT It seems like the main vector the recent vaccines train host immune systems to attack, are the spike proteins that SARS-CoV2 utilizes to enter cells to kickstart the replication process. This got me thinking about that receptor in general, and how that receptor must have other uses within the body, other things that must bind to that receptor in order to do something at the cellular level. So I suppose my question is twofold:
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| Why is time squared in D=1/2gt^2? Posted: 18 Mar 2021 07:28 AM PDT Why is time squared in D=1/2gt^2? I think I can sort of understand why it's 1/2 cuz the trajectory path is one half of a parabola (though that's just what I thought of, I could be totally wrong there lol) but I don't really understand why t^2. [link] [comments]  |
| Are the proteins expressed by the different COVID vaccines exactly the same? Posted: 18 Mar 2021 10:31 AM PDT |
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