Tuataras have a "third eye" that is "no longer" used for vision. Was it earlier in evolution? Are there creatures with 3 functional eyes in the fossil record? |
- Tuataras have a "third eye" that is "no longer" used for vision. Was it earlier in evolution? Are there creatures with 3 functional eyes in the fossil record?
- Why does waking up with an alarm make you feel more tired then waking up naturally even if the time you woke up naturally is before the alarm?
- If the Solar system revolves around the galaxy, does it mean that future human beings are going to observe other nebulas in different zones of the sky?
- How can certain prescriptions cause weight gain if you don't consume more calories? Where does the weight come from?
- Is molten metal magnetic? What would happen if you put a strong magnet near molten metal?
- Do we know in what direction we'd need to accelerate towards, such that we'd lose all the moment we have gained from the motion of the cosmos?
- If there was a hole that ran directly from one side of the Earth to the other and someone/thing plunged down, what would happen when you pass the center of the Earth?
- Rats are nocturnal, how do rats in the New York City subway keep their circadian rhythm when they are devoid of any daylight?
- How does gravity affect electromagnetic waves?
- Has this astronomical event really never happened before?
- Are all planets really in one plane, or is it just for simplification?
- [Chemistry] What determines if a reaction is endothermic or exothermic?
- When looking at the Milky Way why is there a black center part?
- HIV+ to HIV+ Blood Donations: Yay/Nay?
- Is there a distinct difference between the "north" side of a dipole magnet and the "south" side?
- Why do we need to know the half life of radioactive isotopes/elements?
- Is the Schwarzschild solution slightly inaccurate because of the static assumption?
- Why can you use two different ways(dot product and cross product) to multiply two vectors?
- Why do mints and cough drops suggest you only have one every 2 or so hours?
- How close to the earth could the moon be while still remaining in a "stable" orbit? how much of the night sky would it take up?
- What are the properties of the amplitude of a lightwave?
- Are certain blood types more prone to having conditions/illnesses?
- Why does this bug move in this pattern?
- would a grand unified theory merge the color charges and weak isospin together?
| Posted: 22 Aug 2016 01:10 PM PDT Vertebrates are all basically bilaterally symmetrical. Two arms, two legs, two eyes, two nostrils, etc. Did any animal ever exist that normally had 3 functional eyes instead of 2?? If not, what's the deal with this "third eye" and how was it selected for evolutionarily speaking? [link] [comments]  |
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| Is molten metal magnetic? What would happen if you put a strong magnet near molten metal? Posted: 22 Aug 2016 11:47 AM PDT |
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| Posted: 23 Aug 2016 04:59 AM PDT Would you slingshot back and forth until you lose momentum and get stuck in the middle? This really bothers me [link] [comments]  |
| Posted: 22 Aug 2016 05:03 PM PDT I'm rather curious and Google was not able to pull any results. Since rats are nocturnal animals and they seem to be more active at night in the subways, how do they know their sleep cycles. Just from the standpoint the subway runs 24 hours a day yet there is no natural sunlight or things I could think of that would allow them to keep their rhythm? I'm also aware rats probably run in/out of the subway systems and not all rats will live there. If anything I would have guessed they would sleep at night when less trains run and there is very little action going on in the subway system. Thoughts? [link] [comments]  |
| How does gravity affect electromagnetic waves? Posted: 22 Aug 2016 09:16 PM PDT I was watching Physics Girl's video about black holes, link, and she said that nothing can escape a black hole not even light. Does the gravity also affect electromagnetic waves? [link] [comments]  |
| Has this astronomical event really never happened before? Posted: 22 Aug 2016 04:45 PM PDT Author claims, "On November 20, 2016, an astronomical event begins that will last nine and a half months, culminating in startling concurrence with the vision of Revelation 12. While I am not an astronomer, all my research indicates that this astronomical event, in all its particulars, is unique in the history of man. On November 20, 2016, Jupiter (the King planet) enters into the body (womb) of the constellation Virgo (the virgin). Jupiter, due its retrograde motion, will spend the next 9 ½ months within the womb of Virgo. This length of time corresponds with gestation period of a normal late-term baby." Source is here. Received this link from an otherwise thoughtful friend and I'm, to say the least, incredulous. Would appreciate some help debunking. Edit: Autocorrect error. [link] [comments]  |
| Are all planets really in one plane, or is it just for simplification? Posted: 22 Aug 2016 04:19 PM PDT Hi there ^^ In graphics it always looks like all planets circle their star while laying more or less in one plane. Is this true, or is this just to simplify things? [link] [comments]  |
| [Chemistry] What determines if a reaction is endothermic or exothermic? Posted: 23 Aug 2016 12:20 AM PDT In our thermodynamics unit in chemistry, we learned all about chemical reactions and changes in entropy and enthalpy, but we never discussed what actually determines if a reaction releases or absorbs heat energy? [link] [comments]  |
| When looking at the Milky Way why is there a black center part? Posted: 23 Aug 2016 02:15 AM PDT There was a frontpage post with this image. As you approach the Milky Way from let's say the left, you see more and more and more stars (because you are looking at the center of our galaxy) but then there is this sudden black part, followed by a lighter part where are more stars again. So lot's of stars followed by few stars, followed by lot's of stars. Why is that? [link] [comments]  |
| HIV+ to HIV+ Blood Donations: Yay/Nay? Posted: 22 Aug 2016 10:00 PM PDT The recent developments in terms of solid organ transplantations between a HIV+ donor and HIV+ recipient in South Africa, America and the UK are of course excellent and very promising and free up more organs for people who desperately need them, but I was wondering if this same notion is also applicable for blood donations? Obviously HIV+ individuals cannot donate blood to HIV- patients, but is there a medical reason why a HIV+ cannot donate blood for a HIV+ recipient? Brownie points and mad props for anyone who can also explain if/why live-donor organ transplantations are/not possible between people who are HIV+. [link] [comments]  |
| Is there a distinct difference between the "north" side of a dipole magnet and the "south" side? Posted: 22 Aug 2016 06:40 PM PDT I was reading an excerpt from a geophysics textbook in which the earth is referred to as a sort of large dipole magnet. This information, coupled with the knowledge that the earth's magnetic field has flipped several times throughout history, made me wonder if there is a distinct difference in the behavior of a magnets two poles. [link] [comments]  |
| Why do we need to know the half life of radioactive isotopes/elements? Posted: 22 Aug 2016 06:28 PM PDT I've recently rekindled my love for a computer game I picked up a few years called S.T.A.L.K.E.R. . It's setting is heavily focused on the Chernobyl disaster to which I started reading some articles about the disaster and I see the term half life thrown around alot. I don't understand why its necessary to know the half life. You take something with a half life of thirty years (The formula for a half life t1/2) so one can just say that in sixty years, the isotope should decay entirely. Why not just say 60? Why would you identify the decay as it having a half life of 30? [link] [comments]  |
| Is the Schwarzschild solution slightly inaccurate because of the static assumption? Posted: 22 Aug 2016 03:53 PM PDT I was reading the Wikipedia article on deriving the Schwarzschild solution, and I noticed that in the diagonalising the metric step they use the static assumption to show that there is no time component in any of the spacial metric components because the geometry of the space does not change with time. Isn't this assumption untrue because the space evolves with time due to dark energy/the cosmological constant? It would probably be a minuscule effect, but still present right? I may be completely wrong because I struggle to follow all of the math after the Christoffel symbols so it may be corrected for later. Thanks [link] [comments]  |
| Why can you use two different ways(dot product and cross product) to multiply two vectors? Posted: 22 Aug 2016 10:08 PM PDT |
| Why do mints and cough drops suggest you only have one every 2 or so hours? Posted: 22 Aug 2016 05:35 PM PDT Everybody I've met consumes these things every five minutes or so, with no repercussions. [link] [comments]  |
| Posted: 22 Aug 2016 01:48 PM PDT I'll define stable as "it won't crash into the earth until long after life on earth has vanished" [link] [comments]  |
| What are the properties of the amplitude of a lightwave? Posted: 22 Aug 2016 04:28 PM PDT I know that the frequency (length) of a lightwave is measurable spatially and that frequency affects our perception of the wave's color. Is the amplitude of a lightwave measurable spatially? Is amplitude a function of length? Does amplitude affect any perceptible properties of the lightwave (brightness/some other thing I don't know about)? [link] [comments]  |
| Are certain blood types more prone to having conditions/illnesses? Posted: 22 Aug 2016 10:13 AM PDT I was wondering if specific blood types were more likely to suffer from certain conditions or illnesses. Like are B+ people more likely to have genetic issues or A- to getting certain cancers, etc. [link] [comments]  |
| Why does this bug move in this pattern? Posted: 22 Aug 2016 03:21 PM PDT Saw this pic over at /r/mildyinteresting and was curious why it moved in that specific pattern, comments didn't have anything to weigh in on it. So what's going on here? [link] [comments]  |
| would a grand unified theory merge the color charges and weak isospin together? Posted: 22 Aug 2016 05:09 PM PDT I may be misunderstaning, but from my studies I assume that the W± bosons were just supposed to carry isospins of up-andtidown and down-antiup in the same way gluons carry color-anticolor pairs as I understand it, a grand unified theory is supposed to mix the strong and electroweak forces, and adds bosons that turn colorless particles with weak isospin into colored particles without weak isospin, in other words it would the particles added would be color-antiisospin and isospin-anticolor. if so, does this mean that they're essentially five types of the same charge? [link] [comments]  |
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