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Monday, July 31, 2017

If humans have evolved to have hair on their head, then why do we get bald? And why does this occur mostly to men, and don't we lose the rest of our hair over time, such as our eyebrows?

If humans have evolved to have hair on their head, then why do we get bald? And why does this occur mostly to men, and don't we lose the rest of our hair over time, such as our eyebrows?

If humans have evolved to have hair on their head, then why do we get bald? And why does this occur mostly to men, and don't we lose the rest of our hair over time, such as our eyebrows?

Posted: 30 Jul 2017 10:57 PM PDT

Why do people snort cocaine instead of drinking it or otherwise consuming it?

Posted: 31 Jul 2017 12:09 AM PDT

Got into a late night conversation and now I'm curious. What does science have to say?

submitted by /u/JoeMoMo499
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Do all humans perceive colors on a equal spectrum (color blindness aside) or can certain individuals/groups perceive a wider or narrower scale?

Posted: 31 Jul 2017 05:04 AM PDT

[Biology] What causes some people to be more prone to headaches than others?

Posted: 30 Jul 2017 07:41 AM PDT

Do scientists understand the internal anatomy of Dinosaurs or only the skeletal system?

Posted: 30 Jul 2017 10:35 PM PDT

Organs layout, vessels, neuro-anatomy. What are the tests or ways that they are trying to figure this information out. This applies to any extinct organism.

submitted by /u/mothafuckin-drybones
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If you move a wild bug far from its home but the same environment will it go back home or make a new life there?

Posted: 30 Jul 2017 03:35 PM PDT

Like if you took a grasshopper from one side of a lake to the other, one mile away, could it make the trek home? Would it stay there and find a new cluster of grasshoppers like it? Would it starve and die?

submitted by /u/TheDude9357
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If a helicopter hovers above the earth will the earth move under it or will the helicopter stay with the earth?

Posted: 30 Jul 2017 07:26 PM PDT

Why is the earths core so hot?

Posted: 30 Jul 2017 10:50 PM PDT

It's a question that has always bothered me. What exactly makes the Earth's core so hot? Why hasn't it cooled yet?

submitted by /u/Gaarnar13
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How do fighter jets detect incoming missiles?

Posted: 31 Jul 2017 06:14 AM PDT

Regarding the matter-antimatter imbalance and neutrinos: Did the same (ever-so-slight) imbalance between matter and anti-matter apply to neutrinos as well?

Posted: 31 Jul 2017 06:00 AM PDT

I'm trying to ascertain whether some clue could be garnered if we study neutrinos and anti-neutrinos and the matter-antimatter imbalance in the early universe.

I'm thinking that because neutrinos so rarely interact they would have taken off at straight lines as space-time was being created.

The annihilation process that matter underwent with its antimatter counterparts wouldn't have (or would it?) applied to neutrinos.

Are there any studies that address this possibility, assuming it actually is a correct assumption on my part?

submitted by /u/An_Image_Of_Mohammed
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Is the charge time of a battery linear?

Posted: 30 Jul 2017 04:20 PM PDT

For example: If a battery charges from 0% to 33% in 10 min (not real life times, obviously) then will it be fully charged after 30 minutes? Or it depends on other factors like total capacity, or the current percentage?

submitted by /u/xDesert3agle
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The Earth's internal layers are predicted due to seismic waves and their difference in speeds travelling through them. How did we do the same for the other planets?

Posted: 31 Jul 2017 01:55 AM PDT

I've been through a few threads here that satiated my curiosity about the Earth. Now, I'm curious to know how we estimated the thickness and composition of the other planets. What method did we use to measure from the various satellites we've sent to our planetary neighbours? Thanks!

submitted by /u/Tusjecht
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Why does the proton number define the properties of an atom?

Posted: 30 Jul 2017 03:35 PM PDT

Why is there so much diversity in atomic properties caused solely by changing their protons? Why does adding or removing a proton completely change their appearance and attributes?

submitted by /u/SLTQ
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Do earthquakes have a "season"?

Posted: 30 Jul 2017 05:03 AM PDT

I've been living in Northern Japan for over a year now and have noticed that last spring and summer there were MANY small quakes, like several a month, but in the winter and early spring they stopped, now they have started again so it has made me wonder if there is a "season" for earthquakes. (Or if it's just a coincidence since I have only been here for a short period of time.)

submitted by /u/whoisorange
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Can a diabetic die from eating too much cake?

Posted: 30 Jul 2017 10:51 PM PDT

So I know that a lack of sugar can kill diabetics quite quickly, but high blood sugar just seems to cause chronic issues, like infections.

Could they commit suicide by eating heaps of sugary food, and how long would it take?

Just watched a movie with a suicide like this but I'm doubtful.

submitted by /u/IhadFun1time
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Is it possible that new elements yet to be discovered will be considered stable, or will they all have extremely short half-lives?

Posted: 30 Jul 2017 02:29 PM PDT

Why does metal in a microwave spark?

Posted: 30 Jul 2017 02:56 PM PDT

I can't think of a physical principle that explaines this? It can't be the photoelectric effect right? Microwave photons are low energy. Anyone got an explanation for me?

submitted by /u/bwstunnenberg
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Sunday, July 30, 2017

Why does colored plastic turn white when bent?

Why does colored plastic turn white when bent?

Why does colored plastic turn white when bent?

Posted: 29 Jul 2017 03:39 PM PDT

Do spiders scout out multiple places before deciding to spin their web and if so, are environmental conditions taken into account (wind speed, temperature, humidity, etc.)?

Posted: 29 Jul 2017 05:07 PM PDT

Can you melt wood?

Posted: 29 Jul 2017 05:20 PM PDT

Do stars fuse elements larger than uranium that are unable to escape?

Posted: 30 Jul 2017 06:12 AM PDT

If a car is a faraday cage why do I still get signal?

Posted: 30 Jul 2017 05:45 AM PDT

Many times the car is described similarly to a faraday cage during thunderstrikes. Why is it that I can get electromagnetic signal outside my car if it is a faraday cage. Are the holes of the windows enough to have signal pass through?

submitted by /u/ladald
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How does RFID work?

Posted: 30 Jul 2017 02:35 AM PDT

I've tried Googling this but I can't seem to find an answer that explains RFID in terms of electromagnetism and the physics behind it in detail

submitted by /u/6inchesofsnow
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Blue light affects our sleep, but do colourblind people experience sleep problems from blue light?

Posted: 29 Jul 2017 04:08 PM PDT

Blue light will keep us awake, but will the same light affect a colourblind person?

submitted by /u/ManEatingGnomes
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If/when the Big Rip happens, would hadrons multiply via color confinement? If so, how would this affect inflation?

Posted: 29 Jul 2017 06:38 PM PDT

If two nuclear physicists agree to study a particular electron simultaneously; one measures its position, and the other measures its speed; what would happen to the electron as it would now be in contravention of the Heisenberg Principle?

Posted: 30 Jul 2017 05:48 AM PDT

Why does ice crack when added to warmer liquids?

Posted: 30 Jul 2017 04:03 AM PDT

What causes the heavy feeling in your chest/stomach area when you're nervous?

Posted: 29 Jul 2017 05:04 PM PDT

Why is it so hard to remember our dreams but not our memories?

Posted: 29 Jul 2017 04:19 PM PDT

Why isn't it possible to create a monopolar magnet by just creating a ball of stick magnets with all the same pole pointing inwards/outwards?

Posted: 29 Jul 2017 05:40 PM PDT

Wouldn't that create a magnet which has the same pole on all sides?

For illustration i tried to make a paint sketch:

http://puu.sh/wWC1E/28df902291.png

Why would the magnetic field created by those two be different? Wouldn't both magnetic fields just radiate straight outwards?

submitted by /u/Truckermouse
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Does the definition of "orbit" in astronomy require the barycenter to be within the boundaries of the object that's being orbited?

Posted: 29 Jul 2017 11:41 PM PDT

So does Jupiter technically not orbit the sun?

submitted by /u/monkeyhead_man
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How can we know that a quark is in a superposition before measuring it?

Posted: 30 Jul 2017 01:06 AM PDT

How can we know that a quark is in a superposition before measuring it (Becouse to me it sounds like before I look at something there is everything and when I look there it decides to be a table)?

submitted by /u/sciencesearcher
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Why does the tip of your finger hurt after you cut the nail too short?

Posted: 29 Jul 2017 08:55 AM PDT

How much thrust is produced by the average stream of urine?

Posted: 29 Jul 2017 11:31 PM PDT

Why are the majority of human beings right-handed? Why aren't we all just ambidextrous?

Posted: 29 Jul 2017 10:43 AM PDT

I recently read that ~90% of humans are right-handed and that a similar ratio of right-handedness has been observed in apes. But why? Is/was there some evolutionary benefit or is it just a cultural practice? Why aren't we all 100% ambidextrous?

submitted by /u/Stormaen
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What is it in cigarettes that causes heart attacks, strokes, and aneurysms?

Posted: 29 Jul 2017 12:49 PM PDT

I stopped smoking a few years ago through the use of electronic cigarettes but have been unable to fully ween myself off of nicotine patches, lozenges, and electronic cigarettes.

I was curious if nicotine itself has been tested as being what causes these things in any study, or if it is other chemicals and the tar in cigarettes that cause these problems. I've always been told nicotine just raises your blood pressure and that's about it but that was never from experts/scientists.

submitted by /u/kylepierce11
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Why is a real string pitch depending on the wave amplitude?

Posted: 29 Jul 2017 03:35 PM PDT

When you pick a string on, say, a guitar, with exaggerated force, you may notice a higher pitch, then rapidly decreasing to the expected one when the wave amplitude decreases. This pitch shift is especially noticeable on the lower strings (where larger amplitudes are possible). What is the physical phenomenon leading to this? How can one express this dependence between pitch and amplitude mathematically?

Edit: This is not about higher harmonics. There is a small but perceptible shift of the fundamental towards higher frequencies. My guess is that the deformation applied to the string increases the tension, which in turn increases the wave frequency. Is this a possible explanation?

submitted by /u/marcodr13
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Does sound travel through spiraled tubing at the same speed as through straight tubing?

Posted: 29 Jul 2017 02:21 PM PDT

A co-worker and I are having a disagreement on this issue.

At our job we use headsets connected to a handheld radio for communication. We wear those CIA looking headsets in our ears. The wire runs to a speaker which is clipped to the back of our collar and then the sound travels through a small tubing, which is straight, spirals in the middle, and then loops over the ear and into the earpiece.

I cut my tubing down from the speaker to the spiral, so it stays somewhat tight in my ear.

While assisting a new employee i cut her tubing down even closer to the spiral in the tubing. Almost to the point where the speaker produced sound straight into the spiral before getting to the earpiece.

Halfway through the shift, he speaker blew out and the sound is crackling.

My co worker said the speaker blew because the sound gets too backed up going through the spiral, compressing it and blowing our the speaker.

My argument is that the tubing is all the same diameter, and the sound is traveling at the same rate whether it is straight or spiraled. Also, why wouldn't the spiral compress it even if it did have a few inches of tubing before the spiral.

I have searched for an answer with no luck which is why I am here. My co worker will need me to have some scientific information or sources in order to concede.

Thank you all.

submitted by /u/Steveofcourse123
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Is the light from a color-changing led bulb the same caliber/quality as a dedicated led bulb?

Posted: 29 Jul 2017 10:28 PM PDT

Say for instance the color-changing led is set to the same color temp as a dedicated led bulb (4000k or something). Is the light from the color-changing bulb technically identical to the dedicated led?

submitted by /u/breauxbreaux
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Saturday, July 29, 2017

Why is the human nose the shape it is? Why isn't it just two holes in our face?

Why is the human nose the shape it is? Why isn't it just two holes in our face?

Why is the human nose the shape it is? Why isn't it just two holes in our face?

Posted: 29 Jul 2017 03:59 AM PDT

How high could mountains on Earth grow? Is there evidence of higher mountains in the past?

Posted: 29 Jul 2017 04:55 AM PDT

Given what we know about plate tectonics, erosion and so on, is there a maximum height mountains could grow to?

Could a range like the Himalayas reach 5-10km higher in time and do we have any evidence of this in the past?

submitted by /u/trendyhipsterboi
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I saw a picture claiming that manhole covers are round because a circle is the only shape that can't be made pass through itself. Is it true?

Posted: 29 Jul 2017 03:11 AM PDT

I saw a picture on cracked.com claiming what I described in the title.

I wonder, is it really true?

submitted by /u/DaBeechees
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If I donate blood, then later need a blood transfusion, what are the odds that I'm receiving my own blood?

Posted: 29 Jul 2017 04:20 AM PDT

Why doesn't aluminum seem to glow orange when hot like other metals?

Posted: 29 Jul 2017 04:07 AM PDT

What produces the whistling sound you hear when a large bomb is being dropped or a firework is going off, etc?

Posted: 28 Jul 2017 05:54 PM PDT

Could someone please explain to me why quantum entanglement occurs?

Posted: 28 Jul 2017 11:16 PM PDT

From my understanding of quantum entanglement (it might be wrong) an electron in a pair will tell you information about the other electron in the pair regardless of the distance between them. Also manipulating one electron will affect the other paired electron. If all electron are exactly the same shouldn't one not affect another specific electron. Also when you manipulate electron does the the other electron get affected instantaneously or does it somehow have to communicate with the other electron. If so how fast do they communicate with each other and how do they do it.

submitted by /u/mapzv
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How does nucleation of crystals happen microscopically?

Posted: 29 Jul 2017 02:58 AM PDT

I am trying to purify a rather large batch of Rochelle salt by recrystallization.

I have observed some weird things concerning the nucleation of crystals, and as I want to grow one big single crystal, I want to minimize nucleations.

So my question is as the title says, what happens microscopically during nucleation of crystals?
And how exactly does it explain the following four points:

1) I used an clean old glass oven dish with a lot of scratches with my first batch. Even though there were a lot of scratches only 6 big crystals formed. Why didn't all the scratches form crystals (see also (3))

2) I got one crystal out with a toothpick. The next day, everywhere my toothpick touched the glass small crystals were growing. (I have seen a similar effect with escaping airbubbles in nearly boiling water after stirring with a spoon) How does a wooden toothpick alter the glass surface in such a way that crystals are nucleated wherever it contacted the surface?

3) After the first batch, while resupersaturating a new batch, I cleaned the oven dish with tap water, I dried it with a towel, and rinced it three times with distilled water. (first time I didn't dry it with a towel, I just rinced the dish) The next day the entire bottom of the dish was covered with a layer of small crystals strongly adhered to the bottom of the plate. How did the towel change the glass surface? Probably similar to (1)

4) Since that crystal layer was difficult to remove from the glass, my third batch was in big flexible tupperware(clone) pot. Also with plenty of scratches. Similarly to (1) there were a few big crystals growing.

5) Is there a procedure that minimizes nucleation in general? I want to grow a single, flat crystal with a specific crystal plane pointing upwards on a plane of glass. How can i be sure that I have replicated situation (1) so that I don't have to worry too much about random nuclations spoiling my big crystal?

Thanks!

submitted by /u/Soldersponge
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Do all animal species have reproductive cells with flagella?

Posted: 28 Jul 2017 09:16 AM PDT

How much energy does it take to make an average LED indicator blink?

Posted: 28 Jul 2017 03:25 PM PDT

What sends the original signal in logic gates?

Posted: 28 Jul 2017 04:46 PM PDT

So I was learning about logic gates and how when electrons can flow through it is true (or 1) and when they can't it is 0. now my question is what is the stimulus that makes this logic gates do it and where does it come from? e.g I want true so how does my computer know to send something to the logic gate to allow electrons to flow through and make it true? EDIT: in other words I know transistors are the ones that send true or false, but what sends the signal to them?

submitted by /u/johnlavolpe
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When you double the speed of a sound recording, the pitch doubles. When you double the speed of a video recording, why doesn't the light frequency double?

Posted: 28 Jul 2017 08:06 AM PDT

I got asked this by a student and I'm struggling to put forward a sensible explanation - it feels like it should be obvious, but for the life of me I can't put it into words.

If you play back a 48k audio sample at 96k, then the frequencies double, the length of the sample halves, and the perceived pitch is double. Easy.

If you play back a 30fps video clip at 60fps, then..., well the length of the video clip halves, but it looks the same. Reds are reds, blues are blues. The perceived light "pitch" hasn't changed. Why not? Where's the blueshift?

I'm getting annoyed with myself for not being able to give a sensible explanation. Help! I'm ready to facepalm, please point out the obvious to me :-)

submitted by /u/betamat
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In an X-ray tube, what exactly causes X-rays to be generated from the target? I understand a lot of the energy ends up being heat but what exactly causes the X-rays to be produced?

Posted: 28 Jul 2017 04:01 PM PDT

How does changing the position and/or angle of a laser source affect how the beam travels through a converging lens?

Posted: 28 Jul 2017 04:00 PM PDT

If I point a laser beam anywhere at a converging lens, will the beam always be redirected and reach (a line running through) the center of the lens after it has travelled the focal length of the lens?

For example, this question entails both deviation from the center of the lens, pointing the laser at an angle not perpendicular to the lens, and a combination of both.

Thanks!

submitted by /u/markmcckkenzie
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Why is there a reflective ripple on the pavement of the road when looking at it from a distance(noticeable when driving a car)?

Posted: 28 Jul 2017 07:04 PM PDT

Whenever I'm driving I can see the tires of the car reflected in the road as like almost silvery and wavering. It happens during the day time from what I've seen and only when looking from a considerable distance.

submitted by /u/krowzkore
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Can plasma electrocute you?

Posted: 28 Jul 2017 08:24 AM PDT
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