- How is it so that several (all?) mammals grow and lose a set of "baby teeth" before growing their final dentition? Why stop at two sets when other vertebrates such as sharks regenerate their teeth constantly?
- How does hydrogen embrittlement work?
- If placed in a controlled environment, do trees that normally undergo seasonal leaf Abcission stop losing their leaves?
- How do our eyes avoid being commonly infected through things like rubbing our eyes or the pollutants in the air?
- Whats the difference between an explosive, a propellant and an accelerant?
- Would it be possible to have a ball of electrons?
- Does Ocean Salinity Drop During/After a Rainstorm?
- Statistical Regression: Why don't we care about the t-stat / p-value for the intercept term ?
- Do nocturnal animals prefer sleeping conditions that are dimly lit or bright in contrast to humans which prefer dark conditions?
- How for down into the mantle do we have to go before the temperature is hotter than the surface?
- Would objects orbiting Earth, such as space debris, satellites, the ISS, be hot or cold to the touch?
- Are women born with all their eggs?
- How can we tell if someone we can’t see is shouting from far away or whispering close to us?
- How do phones keep cool with small heatsinks and no fans?
- [Medicine] What leads a body to reject or accept donated organs?
- Why are shadows casted from objects more crisp depending on how far the object is from the ground?
- If the human body has evolved over millions of years to swell up in response to an injury, why are we instructed to apply ice to prevent our evolutionary swelling response?
- How does a train engine, pulling miles of cars and many tons of load, get enough traction to actually move everything?
- What are public and private keys and what do they do for a server when transferring information?
- What is the shape of a transmissions wave? Can this shape be changed? Can motion significantly affect the shape?
- Are there earthquakes in other planets?
- Why don’t we sneeze in our sleep?
- Studies have shown that small movements in the throat occur during an internal dialogue--does that happen when music plays in your head, too?
| Posted: 22 Apr 2018 08:36 PM PDT |
| How does hydrogen embrittlement work? Posted: 23 Apr 2018 04:57 AM PDT |
| Posted: 22 Apr 2018 03:40 PM PDT |
| Posted: 22 Apr 2018 04:26 PM PDT |
| Whats the difference between an explosive, a propellant and an accelerant? Posted: 23 Apr 2018 12:30 AM PDT I'm a bit confused about the differences and whether individual substances might sometimes overlap in function depending on how they're used or if perhaps some are subcategories of another. [link] [comments]  |
| Would it be possible to have a ball of electrons? Posted: 22 Apr 2018 11:14 PM PDT Forgive me i have no way to phrase that doesnt make me sound uneducated. Im working on writing a story for another thread, r/HFY and this as an idea for"faster than light travel" Obviously I'm no scientist, but like I said I'm just trying to slap some science into my story. Would it be possible to contain electrons without a neutron or proton to bond to, in one mass? Enough of them perhaps that this mass, would have it's own gravitational pull. Further more what happens if an object were to be pulled continuously into this gravity? Would it just continue accelerating or is there a cut off point? [link] [comments]  |
| Does Ocean Salinity Drop During/After a Rainstorm? Posted: 22 Apr 2018 11:05 PM PDT I was listening to the "Water's Not Wet" guy, and it got me thinking. The ocean may not "get wet" but rainwater and ocean water are very different in composition. The ocean is salt water and rain is fresh water (or at least has less salinity than the ocean). So my question is this: Does the salinity of the surface of the ocean drop during/after a rainstorm? If so, by how much, and how deep? (Obviously, the bottom of the ocean wouldn't be affected much/quickly by rain at the surface.) Is this something that can be measured, and has it been? If it doesn't change much, is it due to the fact that the ocean is so large that a rainstorm's worth of water won't affect the salinity, even locally? [link] [comments]  |
| Statistical Regression: Why don't we care about the t-stat / p-value for the intercept term ? Posted: 23 Apr 2018 12:40 AM PDT For doing linear regressions, we do care about the t-stat/p-value for coefficients for the independent variables because we would like to see if the estimated coefficients are significantly different from zero. From what I have heard, we don't care much if the t-stat/p-value for the constant/intercept term indicates that the estimated value of the intercept is not significantly different than zero. Why exactly is this though? The value of the intercept is still used in our regression formula, so wouldn't we care about its value too? (Not sure if this is the appropriate question to ask?) Thanks! [link] [comments]  |
| Posted: 22 Apr 2018 09:57 AM PDT |
| How for down into the mantle do we have to go before the temperature is hotter than the surface? Posted: 22 Apr 2018 08:55 PM PDT |
| Posted: 22 Apr 2018 02:14 PM PDT Either way, how hot or cold would the object be that has been orbiting Earth for years? [link] [comments]  |
| Are women born with all their eggs? Posted: 22 Apr 2018 05:18 PM PDT I've always been told that women are born with a set number of eggs and once they run out they're gone. Recently I've also heard that this isn't true. So, are women born with all their eggs? Do we know for sure? If you could link any articles of studies that would be great! [link] [comments]  |
| How can we tell if someone we can’t see is shouting from far away or whispering close to us? Posted: 22 Apr 2018 12:41 PM PDT |
| How do phones keep cool with small heatsinks and no fans? Posted: 22 Apr 2018 10:16 AM PDT |
| [Medicine] What leads a body to reject or accept donated organs? Posted: 22 Apr 2018 11:53 AM PDT |
| Why are shadows casted from objects more crisp depending on how far the object is from the ground? Posted: 22 Apr 2018 11:50 AM PDT |
| Posted: 22 Apr 2018 04:14 AM PDT |
| Posted: 22 Apr 2018 08:33 AM PDT |
| What are public and private keys and what do they do for a server when transferring information? Posted: 22 Apr 2018 05:02 PM PDT |
| Posted: 22 Apr 2018 10:55 PM PDT This is probably in both the physics department. Consider a perfectly straight line separating point A and B. The line is significantly lengthy, but not infinite. There is a car that will travel from A, to B, carrying a transmitter emitting a microwave. I'm automatically assuming that the transmission of the car, while stationary, is perfectly spherical. However, when the car starts moving forward what happens to the shape?
For the sake of this terribly worded exercise, please assume the car can move very fast, just not faster than the speed of light. Basically, what is the shape of a microwave, and does motion affect it? [link] [comments]  |
| Are there earthquakes in other planets? Posted: 22 Apr 2018 09:08 PM PDT Why wouldn't they be? What makes our planet so special to have tectonic plaques that produce earthquakes? Or is that why there are not earthquakes in space, as there is nowhere their earth or, whatever their soil is made of, move? Maybe this is a very stupid question, but I guess... why wouldn't they be? [link] [comments]  |
| Why don’t we sneeze in our sleep? Posted: 22 Apr 2018 11:00 AM PDT |
| Posted: 22 Apr 2018 04:28 AM PDT The movements are similar to the ones used during speech and even certain parts of the brain are active both during the internal dialogue and speaking (IIRC). But what about the music that plays in your head? Be it some earworm or a personal favorite, most people have music in their head at one time or another throughout the day. Does the same activity in the brain and throat occur with the music and the vocals? What about the memories of someone speaking? [link] [comments]  |
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