- During sperm production, what is the mechanism which guarantees that half of produced sperm have an X chromosome and half have a Y chromosome? In other words, why are 50% of us male and 50% of us female?
- Do deep sea ecosystems follow the normal seasons?
- Why does helium make voice higher pitched if source frequency remains the same?
- What’s the difference between clinical depression and regular unhappiness?
- Do rubber soles on our shoes actually protect us from lightning strikes?
- Why must therapeutic proteins be stored at 2-8°C to prevent them from degradation and denaturation when proteins in our body are in an environment that's 37°C and are perfectly fine?
- Why doesn't aluminium fuse directly to copper? What determines the kinds of metals that can be fused or amalgamated among each other?
- Why can’t you take a pulse with your thumb?
- When you look at your reflection on the inside of a metal spoon it appears upside down, why is this so?
- If you are listening to music on your device on mute, does the device still process the sound files, or does it only keep track of the time?
- How are raw alpha particles and electrons collected for use in experiments?
- How do we solve problems that don't have constant acceleration?
- Why do people turn pale when they are frightened or see something shocking?
- [rocket engineering] Ice as rocket fuel ?
- Would a rainbow differ depending on the type of star or atmosphere?
- If sound is just the travel of energy through the movement of air molecules, does a louder sound make air molecules move faster and thus increase the speed of sound?
- Can you have a stable binary planet orbit?
- What's the current state of research for nuclear power regarding efficiency and nuclear waste production?
- How do we estimate the number of people on Earth?
- Why do we find marine and land organisms buried together?
- How exactly does the immune system ward off external parasites?
- Why is this year's flu vaccine so bad?
- How does your finger print grow back after you peel your skin away?
| Posted: 29 Jan 2018 08:24 PM PST |
| Do deep sea ecosystems follow the normal seasons? Posted: 29 Jan 2018 05:46 PM PST Do ecosystems at say the bottom of ocean trenches feel the same changes as the surface or are they mostly constant being so far from the surface? [link] [comments]  |
| Why does helium make voice higher pitched if source frequency remains the same? Posted: 29 Jan 2018 07:15 PM PST I know sound moves faster in helium, but I don't see why frequency should be any different if the source vibration is the same as it is in air. (eg). Say in air, sound speed is R m/s, and there is a vibration at 1 Hz. Vibration starts at t=0. Vibration just started, so distance moved is 0 meters. After 1 second, t= 1, so vibration has moved R(1) = R meters. When t=1, second vibration starts. This distance traveled is 0. Well, because both vibrations move at the same speed, the distance between the first and second vibrations (and 3rd, 4th, etc) is always R meters. And since vibration travels at R m/s, there is a 1 second gap at the receiving end between each vibration. So how does sound speed affect frequency? [link] [comments]  |
| What’s the difference between clinical depression and regular unhappiness? Posted: 29 Jan 2018 03:29 PM PST |
| Do rubber soles on our shoes actually protect us from lightning strikes? Posted: 30 Jan 2018 01:53 AM PST |
| Posted: 30 Jan 2018 02:29 AM PST What happens exactly with the stability of therapeutic proteins when kept at room temperature? [link] [comments]  |
| Posted: 29 Jan 2018 05:53 PM PST Hey there kind scholars! My girlfriend and I have a strange habit of watching old episodes of that Discovery channel show, "How it's made", to relax and sleep. Last night we watched one episode on "Thermal machines" (such as air conditioning units and refrigerators). On a certain moment during the fabrication of the air conditioner, the narrator said that a certain piece of the aluminium "net" component had to be welded to copper using a zinc-aluminium alloy. The question(s) then is (are): Why can't the copper and aluminium be welded directly? What characteristic on a metal determines it to be able to be welded or amalgamated to another? Edit 1: a comma. [link] [comments]  |
| Why can’t you take a pulse with your thumb? Posted: 29 Jan 2018 07:55 PM PST I've been told that your thumb 'has its own pulse' but I don't understand how that would work could someone please explain? [link] [comments]  |
| Posted: 29 Jan 2018 07:13 PM PST |
| Posted: 29 Jan 2018 02:59 PM PST |
| How are raw alpha particles and electrons collected for use in experiments? Posted: 29 Jan 2018 10:26 PM PST In a physics class, our class discussed famous experiments such as Rutherford's Scattering experiment, in which alpha particles were sent into gold foil, deflecting off. How did scientists back in the 1900s (or even now) collect these raw particles for usage? [link] [comments]  |
| How do we solve problems that don't have constant acceleration? Posted: 29 Jan 2018 10:58 AM PST I understand basic physics and how we solve motion problems using kinematic equations, but these all rely on a constant acceleration. How do we solve problems where this isn't the case, such as a rocket leaving Earth's gravity(since acceleration due to gravity gets smaller the further away you are). [link] [comments]  |
| Why do people turn pale when they are frightened or see something shocking? Posted: 29 Jan 2018 01:00 PM PST |
| [rocket engineering] Ice as rocket fuel ? Posted: 30 Jan 2018 02:06 AM PST So, my knowledge of rocket science is basically on the level of "avid Kerbal Space Program player". I understand concepts like Delta-V and TWR. So onto my question. As ice defrosts it becomes liquid and then gas. Now water is a bit of a problem here since it actually gets less dense as a solid, but most things it's the other way around. So picture a tank full of some frozen substance, with a nozzle on the end. As it defrosts and evaporates it builds up pressure, expelling some of the gas out the nozzle - and you have a rocket engine. Since space is cold, you may want to use an electric heater to get it going - much like Ion engines are driven by electricity though I know that electric heating is rather more energy hungry. Of course if the substance in question has an evaporation point above the average temperature of space (to the extent that "temperature" makes sense in a near vaccuum) you may not even need that (at least, closer to the sun). Would such a rocket be viable at all ? How would it compare to say - a xenon Ion engine like we already use ? What substances would make the best candidates for an ice fuel in terms of ISP, delta-V for the weight, energy required to melt it and viability of working with the substance ? Frozen CO2 [dry ice] has been proposed as a generator-driver for Martian colonies - would it be a good candidate ? I'm under no illusions that I've stumbled onto a rocket design that the best engineers at NASA and SpaceX have somehow overlooked - I'm just curious about how the idea would work in practise as a hypothetical and what sort of difficulties you could expect ? I see no viability at all for lifting rockets - so think in terms of vaccuum engines to use to accelerate your probe on it's way after you are already in space (much like Ion engines are used). [link] [comments]  |
| Would a rainbow differ depending on the type of star or atmosphere? Posted: 29 Jan 2018 09:55 AM PST For example could there be a rainbow without Red or Green? Or a Rainbow that is completely blue... etc [link] [comments]  |
| Posted: 29 Jan 2018 05:53 PM PST |
| Can you have a stable binary planet orbit? Posted: 29 Jan 2018 01:36 PM PST I.e. Can two planets of similar size/mass orbit around a point in space between each other while that point orbits around the star of that solar system? [link] [comments]  |
| Posted: 29 Jan 2018 05:21 PM PST (heads up: I'm not very well familiar with advanced chemistry and physics, so I am looking for more of a layman's explanation!) I live in Germany, where nuclear power is commonly not considered clean energy. This is mostly due to the extremly longliving toxic waste it produces. Therefor we have big political movements in Germany pushing for shutting down the nuclear power production all together. Thus (as far as I know) there hasn't been that much modernization going on over the past few decades. A few years ago I read somewhere that nuclear power production today is far below it's potential and that modern scientific research is quite promising regarding the effiency (I think it said that were at ~10% of the potential effiency due to our lack of modernization) and waste production (I remember something about ways to reduce the radioactive waste to minimum of what is currently done). I also remember reading something about ways to recycle spent fuel to bascially use it up until it's gone and power plants that are basically failsafe. Sadly I have no idea where I read this and I don't remember it looking very 'scientific' (iirc it was one of these pseudo-scientific looking inforgraphics). So I was wondering if you could tell me what acutally would be possible if mankind was to decide to heavily invest in modernizing nuclear power production and what could be expected from further research. Are there known ways to get rid of dangerous radioactive waste? Or is this just the propaganda of the nuclear lobby, trying to convince people that renewable energy sources are not the absolutly best option for the future? [link] [comments]  |
| How do we estimate the number of people on Earth? Posted: 29 Jan 2018 02:31 PM PST |
| Why do we find marine and land organisms buried together? Posted: 29 Jan 2018 03:11 PM PST I've been wondering this as I've heard this claim from numerous sources and I just wanted to know, why do we see this? [link] [comments]  |
| How exactly does the immune system ward off external parasites? Posted: 29 Jan 2018 12:57 PM PST My curiosity was piqued by reading about mange in dogs, specifically quotes from this page about how a healthy immune system keeps mites under control:
Source: https://vcahospitals.com/know-your-pet/mange-demodectic-in-dogs Since mites are outside of the body and presumably too large for white blood cells or the typical immune system defense against e.g. bacteria anyway, by what mechanism exactly would it be affecting their reproduction? [link] [comments]  |
| Why is this year's flu vaccine so bad? Posted: 29 Jan 2018 12:28 PM PST |
| How does your finger print grow back after you peel your skin away? Posted: 29 Jan 2018 10:15 AM PST Just curious because I peeled it too far and it's kinda growing back [link] [comments]  |
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