Is the human body affected by the changing seasons? |
- Is the human body affected by the changing seasons?
- What is the cost input/output of current nuclear fusion designs?
- Is there a certain priority list for a severely damaged human body to heal itself?
- If I lift an object up by 1m will its mass increase by a factor of ~g/c^2 from the extra potential energy? If so, is this effect experimentally observable or is gravity too weak?
- What makes two antidepressants in the same class different from one another?
- What are the differences between the mechanisms of bipolar depression and of unipolar depression?
- How have astronomers been able to make reliable estimations about the rotational velocity of galaxies given that an estimated full rotation takes over a billion years and radio telescopes observing them have been around for less then 100 years?
- Do herds of Caribou have a leader?
- What happens when a storm crosses the Grand Canyon?
- Are there any theories of a correlation between massive volcanic eruptions and a reversal of earth's magnetic field?
- What makes nuclear bombs so difficult to build?
- How do cells choreograph their growth to form the proper shape of the bone or organ?
- How do substrates actually get into their active sites in enzymes?
- Do we currently have any precautions installed in case an asteroid starts heading towards Earth? If so, what are they?
- Is there anything that can catalyze nuclear reactions?
- Why do vegetables such as asparagus/beets change the color of our pee, but artificial colors don't?
- Why is the relativistic adiabatic index 4/3?
- When supposing a product solution to solve a linear PDE, how do we rule out existence of solutions that cannot be expressed as a sum of product solutions?
- Where exactly does the energy in a nuclear reaction (fission and fusion) come from, since the number of particles remains unchanged?
- Is there one big, planetwide weather system, or does each country calculate their own? If so, what sort of communication exists between them?
- How does ethanol affect animal cells?
| Is the human body affected by the changing seasons? Posted: 10 May 2018 06:23 AM PDT If we don't grow a winter coat like dogs, we don't have a set mating season, we don't migrate, etc, are we affected in any other way? If not, at what point did we lose those traits? [link] [comments]  |
| What is the cost input/output of current nuclear fusion designs? Posted: 10 May 2018 03:27 AM PDT Unsure whether to flair economics or physics for this, but I was curious as to the current gap in the cost of the energy input to the energy output worth of current nuclear fusion designs. [link] [comments]  |
| Is there a certain priority list for a severely damaged human body to heal itself? Posted: 09 May 2018 07:04 AM PDT Does human body have a priority list for healing the body? For example: if a human body has multiple fractures, severed nerves, multiple lacerated organs, internal bleeding and cuts and bruises, how does the body react to the healing process? Which of the wounds and damaged areas it starts to heal first? I am aware of different kinds of shocks and reactions to the human body, but lets cast those aside. Is it strictly related to DNA only or is there some sort of other mechanisms the body/brain uses? [link] [comments]  |
| Posted: 10 May 2018 05:29 AM PDT |
| What makes two antidepressants in the same class different from one another? Posted: 09 May 2018 08:42 PM PDT I know different classes target different serotonin receptors, but what is the difference between two SSRI's, or two SNRI's? Why does one SSRI work well for someone, but a different SSRI doesn't work at all for them, even though the two drugs are in the same class? And if someone responds well to an SSRI, does that make them more likely to respond well to every SSRI? [link] [comments]  |
| What are the differences between the mechanisms of bipolar depression and of unipolar depression? Posted: 10 May 2018 03:26 AM PDT |
| Posted: 10 May 2018 03:22 AM PDT I was reading some posts on here and on the web about dark matter and why astronomers believe it exists. My understanding is that two of the reasons are connected to observations concerning the rotational speed of galaxies. Firstly, the rotational velocity observed did not match the estimated mass of stars in an observed cluster, secondly that all stars in galaxies appear to rotate at a constant velocity. This I understand. What I don't understand is how can astronomers be so sure about the observed rotational velocities - if a full galaxy rotation takes over a billion years then all that we can have been able to observe since we built radio telescopes is 10 to the power -7 of that rotation (Sorry unable to write maths in word)? Which is a tiny, tiny fraction of a degree. How can they be so sure that there is no sizable error in there - how can they even see that tiny amount of rotation? Lastly, a less clear and perhaps less interesting question, connected to the above, how do they correct for our own Milky Way's galactic rotation when making observations? Presumably they must be able to tell which galaxies are rotating along the same axis as ourselves and which are tilted away from our axis and by how much? I'm running on a layman's assumption that there might be a galaxy rotating identically to the way we rotate in which case surely there'd be no observed rotation? But when they detect a rotation are they able to state with certainty how much the observation is affected by our relative rotation or is that open to error too? [link] [comments]  |
| Do herds of Caribou have a leader? Posted: 09 May 2018 06:54 PM PDT |
| What happens when a storm crosses the Grand Canyon? Posted: 09 May 2018 05:38 PM PDT |
| Posted: 09 May 2018 09:10 PM PDT I was reading this article about increased seismic activity in the Yellowstone basin. In the article it stated that the last major eruption of the Yellowstone super volcano was about 640,000 years ago, which was about the same time as the last magnetic pole reversal. Are both Earth's magnetic field and volcanic activity controlled by Earth's core? [link] [comments]  |
| What makes nuclear bombs so difficult to build? Posted: 09 May 2018 08:23 PM PDT I see in the news developing countries threaten to build a nuke. What are the barriers to making them and why do developing nations struggle with it? [link] [comments]  |
| How do cells choreograph their growth to form the proper shape of the bone or organ? Posted: 09 May 2018 05:53 PM PDT As the title asks, how do cells know what the boundaries of their growth should be (non cancerous) and choreograph proper organ and bone formation? In other words, how do cells know which direction to grow in order to form the normal shape of that tissue? In my mind, there would have to be some separate process in charge of controlling the cells that is aware of the position of each cell and can control the growth speed and direction. But I feel that is probably wrong. I understand the concept of stem cells becoming specialized cells, with full instructions about what the cell should be and how it behaves. What i don't understand is the choreography involved in shaping. [link] [comments]  |
| How do substrates actually get into their active sites in enzymes? Posted: 09 May 2018 08:57 PM PDT It seems that the chances of the substrates finding their way into the active site would be very uncommon due to their complex shapes, is there an aid or is it just through concentration of both elements? [link] [comments]  |
| Posted: 09 May 2018 03:11 PM PDT |
| Is there anything that can catalyze nuclear reactions? Posted: 09 May 2018 05:52 PM PDT |
| Why do vegetables such as asparagus/beets change the color of our pee, but artificial colors don't? Posted: 09 May 2018 08:03 PM PDT |
| Why is the relativistic adiabatic index 4/3? Posted: 09 May 2018 05:30 PM PDT I was told that in the relativistic limit the adiabatic index approaches 4/3 for a monoatomic gas instead of 5/3 in the non-relativistic case. I was told this occurs due to a reduction in degree of freedom but this may be incomplete and does not quite explain the new expression since adiabatic index = (n + 2)/n where n is the # of degrees of freedom. Thus I am wondering both quantitatively and qualitatively, why does the adiabatic index decrease, and to 4/3 specifically, in the relativistic regime for a monoatomic gas? [link] [comments]  |
| Posted: 09 May 2018 05:28 PM PDT In part I want to know how this was justified historically, if it was at all. This is for a presentation about fourier series and I want the logic to be as airtight as possible. I'm willing to weaken the assumptions to avoid having to say "... which we know for technical reasons too advanced to get into." in Fourier's book The Analytic Theory of Heat (1822), where he first develops fourier series, he uses the product solution trick to solve the heat equation. He does not explicitly address the question of whether there could be solutions that aren't a sum of products. He does prove uniqueness of his solutions, but only in a framework that presupposes his general form encompasses all possible solutions. Was Fourier being sloppy relative to modern standards of rigor, or is there some unstated result he's relying on? I'm aware that, in the language of functional analysis, it's not difficult to show a fourier series converges to its associated function if the latter is in the right space, and that this was shown contemporaneous to Fourier. What I'm looking for is, how do we (or how did Fourier) justify the conclusion we found the full solution of the linear PDE when we solved it by assuming the solution can be expressed as a sum of products of functions of one variable. [link] [comments]  |
| Posted: 09 May 2018 03:01 PM PDT I know it has something to do with changes in the amount of energy holding atoms together, but I feel really fuzzy on that. [link] [comments]  |
| Posted: 09 May 2018 08:19 AM PDT |
| How does ethanol affect animal cells? Posted: 09 May 2018 06:38 PM PDT Does it interact with receptors or does it pass throught the lipid bilayer? If the latter, What does it interact with inside of the cell? Thanks in advance [link] [comments]  |
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