Why do we use factorial to get possible combinations in the card deck? |
- Why do we use factorial to get possible combinations in the card deck?
- How accurate are these images of brains depicting mental conditions?
- Why can't a human and sheep reproduce?
- If you took 100 liters of water at 80 degrees and mixed it with 100 liters of water at 60 degrees, would you get 200 liters of 70 degree water?
- Do tardigrades have bones? How do they move around?
- Why don't I ever experience destructive interference of sound waves from two speakers?
- By what mechanism is Vitamin C supposed to help the immune system?
- Does the six-carbon ring in serotonin have resonance?
- Is there a diamond equivalent for silicon?
- Why is expansion work by the gas in thermodynamics sometimes considered positive and sometimes negative?
- Can our subconscious understand negative statements?
- Are people with darker skin better suited to living in sunny conditions?
- What is the efficiency of laser cooling vs other methods?
- Is there credible research linking antiperspirant usage to breast cancer?
- How can a black hole be so much smaller than a neutron star? Aren't neutron stars already super dense and without orbitting electrons, so without any void between nucleons?
- Are the ice caps melting?
- How can I tell if an object is accelerating?
- Are there any "ungraphable" functions?
- Due to the two hemispheres of the brain processing different information, would being deaf in one ear affect the development of the corresponding part of the brain?
- Would you see the end of the universe before you could ever enter a black hole?
- What is the earlierst true bird we know of?
| Why do we use factorial to get possible combinations in the card deck? Posted: 01 Dec 2015 04:42 AM PST I saw this famous fact in some thead on reddit that there are less visible stars than there are possible combinations of outcomes when shuffling a deck of 52 cards. That is by using factorial. And I've been taught that x! or "factorial" is an arithmetic process used only when elements of the group can repeat themselves, i.e. your outcome could be a deck full of aces. But this outcome is impossible. If this is wrong, does this mean that there is a different proces than factorial that gives you even larger number? [link] [8 comments]  |
| How accurate are these images of brains depicting mental conditions? Posted: 30 Nov 2015 08:05 PM PST |
| Why can't a human and sheep reproduce? Posted: 30 Nov 2015 08:59 PM PST Hello askscience! I am aware that we do not share the same number of chromosomes as sheep which is a reason why we cannot reproduce with eachother. However, a 45 year old man and I got in a heated (on his side) debate claiming that it has happened before, and even went so far as to say he was taught that in school, and other things that I can only describe as complete bullsh*t. I am searching for a more detailed answer as to why we can't cross-breed, specifically with sheep, since my answer wasn't good enough for him, and to be honest I would just like to prove him wrong. Thank you! [link] [61 comments]  |
| Posted: 01 Dec 2015 05:40 AM PST |
| Do tardigrades have bones? How do they move around? Posted: 30 Nov 2015 12:06 PM PST I came across this gif recently and while I'm sure it's just a simulation of how they would move it's got me wondering, do tardigrades have bones or even cartilage? Can that kind of thing exist at such a small scale? How do they move around? [link] [7 comments]  |
| Why don't I ever experience destructive interference of sound waves from two speakers? Posted: 30 Nov 2015 06:56 PM PST I would think that, if I had two speakers on my desk, playing the same sound, the speakers would have a small chance to play the sound back just right so that they interfere and the sound is made quieter. I would assume that the speakers are not playing the sound exactly synchronized all the time, so I would expect to hear (if not often, but at least every now and then) the sound canceling out and being quieter. However, I have never experienced this, so why? [link] [10 comments]  |
| By what mechanism is Vitamin C supposed to help the immune system? Posted: 30 Nov 2015 11:44 AM PST |
| Does the six-carbon ring in serotonin have resonance? Posted: 30 Nov 2015 05:51 PM PST I'm finding conflicting answers on the internet. [link] [3 comments]  |
| Is there a diamond equivalent for silicon? Posted: 30 Nov 2015 04:43 PM PST I understand that silicon shares certain properties with carbon. Can it arrange itself into a diamond-type structure? [link] [6 comments]  |
| Posted: 30 Nov 2015 05:37 PM PST I've known throughout high school and first-year university that the formula for work is W=integral of Pext *dV. The only time I've seen a negative sign in that equation is in springs, where the force and extension are in opposite directions. Now in my thermodynamics course, work BY the gas has been introduced as being negative. I can see why this makes sense when compared with internal energy and heat, since the equation changes from dU=dQ-dW into dU=dQ+dW, but how is there argument over what the work done actually is, isn't work a well defined concept in physics and by extension thermodynamics? [link] [6 comments]  |
| Can our subconscious understand negative statements? Posted: 01 Dec 2015 01:13 AM PST In many (often self-improvement) books it is stated that our subconscious cannot understand negation, so supposedly "Be smoke-free" is much better than "Don't smoke" as a goal:
How much merit is there to this idea? Edit: I tagged this as psychology, but I think it could also be part of neuroscience.. [link] [comment]  |
| Are people with darker skin better suited to living in sunny conditions? Posted: 30 Nov 2015 06:58 PM PST |
| What is the efficiency of laser cooling vs other methods? Posted: 30 Nov 2015 09:04 PM PST The sort of scenario that I'm thinking of is: If you had a refrigerator who's goal is to cool it's contents to some moderate temperature, say 5 degrees celsius, how much energy would it take some theoretical laser cooling system vs your average compressor based fridge. Maybe the laser is cooling some matter that has a coolant being circulated through it or something. I imagine that's not practical, and that there are many theoretical and practical problems with it, and I'd love for you to tell me what those problems are, but I'm just trying to get an idea of "energy per degree cooled" if that makes sense. Thanks! [link] [4 comments]  |
| Is there credible research linking antiperspirant usage to breast cancer? Posted: 30 Nov 2015 10:47 AM PST |
| Posted: 30 Nov 2015 10:30 AM PST |
| Posted: 30 Nov 2015 11:44 PM PST I have a friend that is constantly sending me links trying to disprove climate change. He sent me this link and it was the first time I've been confused by information he showed me. Is this an accurate explanation of the data and what does it mean if the ice caps aren't melting? Just looking for a succinct rebuttal or an explanation that contextualises the data. [link] [2 comments]  |
| How can I tell if an object is accelerating? Posted: 30 Nov 2015 07:20 PM PST I know, usually the answer is if the velocity is changing, but I'm talking about when you don't know if the velocity is changing. Maybe the observer's velocity is changing and therefore if appears to him/her that the object is changing velocities, when in reality it might be completely still or have a constant velocity. Also, I want to avoid answers that explain that one can sense both acceleration and jerk, I'm talking about an observer that only has sight. Another way to explain this problem is if the only thing you knew was that the distance between two objects was changing and the rate at which the distance changes was changing, therefore you knew there was some sort of acceleration. Thanks [link] [4 comments]  |
| Are there any "ungraphable" functions? Posted: 30 Nov 2015 11:51 AM PST Are there any functions that cannot, for whatever reason, be represented on a plot of y against x? [link] [23 comments]  |
| Posted: 30 Nov 2015 06:37 PM PST I've always wondered if being deaf in my right ear stunted the development of my left hemisphere. [link] [4 comments]  |
| Would you see the end of the universe before you could ever enter a black hole? Posted: 30 Nov 2015 01:13 PM PST So if my understanding of black holes is correct, time does not move in your reference frame within a black hole's schwarzchild radius. Does this suggest as you get close to the schwarzchild radius time travels slower so more time passes outside of your reference frame meaning as you get very close you should witness the end of the universe before you enter the schwarzchild radius? Does this mean someone with force preventing them accelerating towards the black hole couldn't witness someone enter the black hole and would instead see them slowing down? [link] [16 comments]  |
| What is the earlierst true bird we know of? Posted: 30 Nov 2015 10:41 AM PST When I ask that question I always get "Archaeopteryx" or "Protoavis" as an answer. But these aren't true birds (they aren't in the group Aves), are they? So what is the oldest i.e. earliest species/genus that gets placed within the clade Aves? [link] [1 comment]  |
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