- Today i dripped some super glue on the colored print of my t-shirt by accident. To my surprise my t-shirt got really hot where the glue had landed and started to fizzle and smoke quite a lot. Does anyone have an idea of why this happens?
- What exactly causes flame coloring when burning sodium chloride?
- Why do some people have good singing voices and some people don't?
- Why do small spiders have venom so strong it can kill a human?
- What is the best measure of human intelligence?
- How does the act of someone throwing themselves over a grenade mitigate the explosion as much as it does?
- Does Adrenaline really reduce reaction time?
- How does encryption work?
- How does one's long term environment affect their perception of sound?
- Does the heat generated by a military grade laser weapon generate any "impact" when striking a target or do they only generate heat?
- Are males and females equally effected by genetic disorders?
- What are the empirically proven cognitive and affective benefits of reading often and/or reading every night before going to bed?
- Why isn't blood from a transfusion rejected by the body?
- How does a Krasnikov tube work?
- How and why can the Earth's magnetic poles suddenly "flip?"
- Why does hair grow faster with higher atmospheric pressure?
- I grew up learning that no two objects can occupy the same space at the same time. So how and why are Neutrino's so special?
- Do any eukaryotic organisms have both mitochondrial and vestigial prokaryotic respiration mechanisms?
- How does the optic nerve know what color a particular photoreceptor in the eye is responsible for?
- What are the rays of light when looking at lightsource with eyes squeezed?
- When I put ice in a glass of water, and the water gets colder, where does the heat go?
| Posted: 16 Nov 2015 11:23 AM PST EDIT: Thanks for all the cool and informative comments everyone! Shirt is ruined and so is my lovely chest hair but at least I wasn't burned or anything [link] [467 comments]  |
| What exactly causes flame coloring when burning sodium chloride? Posted: 17 Nov 2015 05:30 AM PST Usually sodium in atomic form has its outer electron risen in energy level by the heat of the flame. The electron falling back to a normal energy level emits light (reflects light?) in a specific wave length. In sodium chloride the sodium is in its ionic form thus has no outer electron. Where does it get it from? I read about it a bit and found two answers:
Do both phenomena occur? If yes, which one is more probable? If no, oviously, which one is correct and if neither, is there an other explanation for it? Thanks for your answers! [link] [1 comment]  |
| Why do some people have good singing voices and some people don't? Posted: 16 Nov 2015 09:50 AM PST Is there an evolutionary reason behind this or just something that happens at random? [link] [27 comments]  |
| Why do small spiders have venom so strong it can kill a human? Posted: 16 Nov 2015 01:45 PM PST If it can kill a human, it would certainly seem very overkill for its intended pray? [link] [14 comments]  |
| What is the best measure of human intelligence? Posted: 16 Nov 2015 08:14 PM PST What is the best measurement of human intelligence? Are there any meta analyses that really pin down the best measurement of general intelligence? [link] [12 comments]  |
| Posted: 16 Nov 2015 09:02 AM PST I've seen plenty of talk about individuals doing so and surviving and even this recent post in /r/todayilearned about someone doing it with two grenades. Is it simply just not giving the explosion room to expand? Or is the mass of a body acting on a grenade also significant? [link] [25 comments]  |
| Does Adrenaline really reduce reaction time? Posted: 15 Nov 2015 06:09 AM PST I've always heard that in a stressful "fight or flight" situation, reaction time is reduced (in addition to increased strength, etc.); that being said it seems like the sort of thing that could be a myth or widespread misinformation. I suppose the exact question I have is: Does adrenaline reduce reaction time and if so how, and by how much? [link] [494 comments]  |
| Posted: 16 Nov 2015 09:42 PM PST I understand that the data is transformed, and that a key is required to decipher the data, but what is preventing the key from being intercepted and used to decrypt the data? That is, how is the security of the key ensured? [link] [1 comment]  |
| How does one's long term environment affect their perception of sound? Posted: 16 Nov 2015 10:34 AM PST I know that in some early studies of psycho acoustics there were problems where the subjects taking public transport had the environmental noise affect their perception of sound even hours after being isolated. Is there evidence of longer term effects? For example, is the hearing of someone from a rural environment different than someone from an urban environment aside from usual hearing loss? [link] [7 comments]  |
| Posted: 16 Nov 2015 12:23 PM PST |
| Are males and females equally effected by genetic disorders? Posted: 16 Nov 2015 02:10 PM PST Are there some genetic disorders that males can get but not females or vice versa? If so why does it happen? [link] [6 comments]  |
| Posted: 16 Nov 2015 05:19 PM PST |
| Why isn't blood from a transfusion rejected by the body? Posted: 16 Nov 2015 01:33 PM PST I know that for a blood transfusion to be viable both parties must have the same blood type (or O) so that the donor's blood isn't seen an 'non-self' and attacked by the immune system. So why is it that in the case of transplanted organs which also have to be donated by someone of the same blood type, the body rejects it if immunosuppressants aren't taken. Why is it that transplant organs are rejected but 'transplant blood' isn't rejected? [link] [8 comments]  |
| How does a Krasnikov tube work? Posted: 16 Nov 2015 12:31 PM PST Why can matter travel faster than the speed of light in one? [link] [4 comments]  |
| How and why can the Earth's magnetic poles suddenly "flip?" Posted: 16 Nov 2015 06:09 PM PST And what does it mean for the magnetic field to be "tangled?" Why do the magnetic poles drift? Thanks. [link] [comment]  |
| Why does hair grow faster with higher atmospheric pressure? Posted: 16 Nov 2015 12:59 PM PST According to this article, Cousteau stayed in an underwater lab for a month. They said that: "Your hair grows faster, your voice is higher -- due to atmospheric pressure -- and for some reason you can't whistle (try and you will fail)." What about the increased pressure makes those things happen? [link] [3 comments]  |
| Posted: 16 Nov 2015 10:37 AM PST I was reading that Neutrino's are able to pass through matter unimpeded, and this must mean they can occupy the same space at the same time as other matter. I thought this was physically impossible. At least according to my high school physics education. [link] [22 comments]  |
| Posted: 16 Nov 2015 11:05 AM PST Also - have some eukaryotic organisms re-purposed their vestigial prokaryotic respiration machinery? Otherwise, are all eukaryots then simply missing every prokaryotic membrane structure used in respiration? [link] [5 comments]  |
| How does the optic nerve know what color a particular photoreceptor in the eye is responsible for? Posted: 16 Nov 2015 03:26 AM PST |
| What are the rays of light when looking at lightsource with eyes squeezed? Posted: 16 Nov 2015 09:00 AM PST |
| When I put ice in a glass of water, and the water gets colder, where does the heat go? Posted: 16 Nov 2015 01:02 PM PST My understanding is that you can't technically "spread" cold, since cold is just the absence of heat. So the heat that was in the water is going somewhere, right? It seems like it would have to go into the ice in order to melt it, but when the ice melts the glass is still colder than when it started, so somehow the ice removed heat. I don't get it. [link] [7 comments]  |
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