- I heard that detergents, soaps, and surfactants have a polar end and a non-polar end, and are thus able to dissolve grease. But so do fatty acids; the carboxyl end (the acid part) is polar, and the long hydrocarbon tail is non-polar. So why don't fatty acids behave like soap? What's the difference?
- What is the "lowest" life form that performs a stretching reflex?
- Why does blue seem to be the hardest color to achieve for so many things, such as LEDs, fireworks, and paints or dyes?
- Why did the Space Shuttle have a roll maneuver, as opposed to just launching in the right orientation?
- Why don’t physicists use relativistic mass anymore?
- Do adult animals recognize their own siblings when they encounter each other in the wild?
- What makes you wake up?
- How much copper can D-penicillamine (DPA) chelate?
- Does air have its own form of “surface tension” the same way water does?
- How can scientists tell that there is very little antimatter in the universe?
- Would you travel a further relative distance on the larger of concentric spheres or the same?
- Do interests/hobbies developed due to the environment or predisposition genetics?
- Does the optical fiber reflect all types of light?
- How do Galaxies Accelerate?
- I know the difference between venomous and poisonous, but does this distinction only apply to animals? Are there venomous plants?
- How do analog devices effectively use such high frequencies, but silicon devices are limited to the low GHz range?
- Does a virus always inject itself into the same location within a chromosome?
- What is the actual difference between scattering and absorption at the atomic level, if both are exciting molecules, albeit at different magnitude?
- Why can flies easily enter a trap but struggle to get out?
- How do spacecraft navigate in space even though there's no fixed point about which a co-ordinate system can be made, and there's no concept of direction in space like north-south or up-down?
- What causes the initial signal from our brains to be fired when we decide to move a limb?
- What manipulates the taste and texture of different types of meats?
| Posted: 15 Jul 2018 02:30 PM PDT Bonus question: what is the difference between a surfactant and a soap and a detergent? [link] [comments]  |
| What is the "lowest" life form that performs a stretching reflex? Posted: 15 Jul 2018 02:33 PM PDT As I'm scrolling through r/aww and such, I see pics of small animals stretching their limbs in a kind of reflex fashion. Just wondering if anyone knows the earliest (or I guess "lowest") life form this has been observed in. Edit: to clarify what I mean by "lowest," I guess I mean that out of all the evolutionary branches that exhibit this behavior (or a behavior that approximates it), the earliest branch that does not include humans that has extant species. Edit 2: Bonus if anyone can answer the same question for yawning. [link] [comments]  |
| Posted: 15 Jul 2018 03:03 PM PDT What makes blue special? Also what category would this be? [link] [comments]  |
| Posted: 15 Jul 2018 01:53 PM PDT It's funny, I didn't even think about it until I started making shuttles in Kerbal Space Program. Launching as the real Shuttle did gives me stability issues in the game while performing the roll, so I launch with the shuttle already facing the right way. Was there a reason the Shuttle didn't launch facing east to begin with? [link] [comments]  |
| Why don’t physicists use relativistic mass anymore? Posted: 15 Jul 2018 11:37 AM PDT |
| Do adult animals recognize their own siblings when they encounter each other in the wild? Posted: 15 Jul 2018 11:13 AM PDT |
| Posted: 15 Jul 2018 08:51 PM PDT So what makes people wake up naturally? Is it our internal clock or is it just our bodies saying we've had enough rest? I ask this because I've found that sometimes if I go to bed late then I'll wake up earlier than if I went to bed early. [link] [comments]  |
| How much copper can D-penicillamine (DPA) chelate? Posted: 16 Jul 2018 06:03 AM PDT Hi, I have 0 background knowledge in chemistry and this is not for a homework. It's actually for better understanding of Wilson's disease. I've read in "Chelation Therapy in the Treatment of Metal Intoxication (2016)" that in vitro 1000mg of D-penicillamine (DPA) chelates about 200mg of copper but in actuality only 1% (10mg) is secreted out of the body. How did the authors come up with this number and are there more empirical results on the drug's effectiveness as a chelator? Another question is how do scientists and doctors measure how long before each meal should DPA be taken? Thanks. [link] [comments]  |
| Does air have its own form of “surface tension” the same way water does? Posted: 16 Jul 2018 12:38 AM PDT My assumption is that the atoms are too far apart to create any form of tension compared to water. But would this be the case in a pressurized environment? [link] [comments]  |
| How can scientists tell that there is very little antimatter in the universe? Posted: 16 Jul 2018 12:19 AM PDT Based on the Wikipedia level reading I've done it appears that in all respects antimatter should behave exactly as "regular" matter. So then how can we be sure that there aren't galaxies, stars, etc made of antimatter? What led scientists to the conclusion that all of the universe is made out of regular matter? I'm not suggesting that there isn't an imbalance or that antimatter galaxies exist. I'm only asking how scientists, who know more than me, came to the conclusion that the universe is almost entirely regular matter when it should be observationally identical. [link] [comments]  |
| Would you travel a further relative distance on the larger of concentric spheres or the same? Posted: 16 Jul 2018 03:01 AM PDT I was recently thinking about space flight/air travel etc and i couldnt logically come to a conclusion of this: Imagine a sphere with centre point (equidistant to all other points on the sphere in 3axis) Now another larger sphere encompassing the smaller sphere but with the same centre point in space. You are standing at a point (x) on the larger sphere with a line bisecting the centre point (c) and outer surface of the smaller sphere (y). You travel a distance (d) from (x) on the surface of the outer sphere to point (x1) with the same line bisecting the centre point of both spheres concentrically and where you stop at (x1) the line now bisects the smaller sphere's surface at (y1) and the distance between (y) and (y1) is now (d1). Does (d) = (d1)? And what does this mean in terms of relativity for example does a person walking on the surface of a planet walk the same or more distance as a satellite traveling the same speed in the same amount of time in orbit? [link] [comments]  |
| Do interests/hobbies developed due to the environment or predisposition genetics? Posted: 16 Jul 2018 04:45 AM PDT |
| Does the optical fiber reflect all types of light? Posted: 16 Jul 2018 04:27 AM PDT I just finished watching a video demonstration showing a fiber optic cable struck by two types of lasers, one green and one red. The cable transmitted the green light beam without problems, while the red one could not cross it. How does this happen? [link] [comments]  |
| Posted: 16 Jul 2018 12:48 AM PDT I apologize if this is not flaired properly. I was having a discussion with someone about the speeds that galaxies accelerate at. He was saying that in order to calculate the velocity of a galaxy, it would be as easy as using distance over time. I fervently disagreed. I said that at the order of magnitude of a galaxy, moving from Point A to Point B is not that simple. Time will be affected by the gravitational field around the galaxy. Additionally, at this size, spacetime is moving itself. So deciding a point is not so simple. Was what I said anywhere close to the truth? [link] [comments]  |
| Posted: 15 Jul 2018 04:49 PM PDT I know there's a lot of plants that can sting you if you touch them like stinging nettle, but are they considered venomous? [link] [comments]  |
| Posted: 15 Jul 2018 03:42 PM PDT I understand that a complex silicon device like a CPU is frequency limited by a number of factors such as signal propagation delay, but silicon transistors do have a fundamental switching frequency limit (ex. FinFET transistors seem to be workable up to ~30GHz from a quick Google search). But radio frequency equipment (even really old stuff) can go into hundreds of GHz and even into THz frequencies when looking at things like radio transmission/reception and astronomy research. If you are transmitting and/or receiving signals on carriers that are hundreds of times faster than the fastest silicon transistors can switch, how are we able to make use of these parts of the spectrum? Light is just extremely high frequency EM radiation, and fiber optics make use of only a tiny sliver of the available bandwidth of visible light (as far as I understand it). Is that also the case with millimeter and sub-millimeter wave radio? [link] [comments]  |
| Does a virus always inject itself into the same location within a chromosome? Posted: 15 Jul 2018 10:01 PM PDT I was reading about the HeLa cell lines, and the book mentioned that the reason that the cells were able to divide indefinitely is that the HPV-18 virus infected a segment of the 11th chromosome that was important in suppressing tumors. That made me wonder if that particular virus always inserted itself into that region of the 11th chromosome, or if it just inserted itself into the first region of DNA that it fit? [link] [comments]  |
| Posted: 15 Jul 2018 07:54 AM PDT I understand absorption and scattering is what gives things color, like why Chlorophyll is green (because it absorbs more in the red/blue levels), and water is bluish (since it absorbs more in the red region). BUT I don't understand why this difference occurs; Why is resonant frequencies absorbed by molecules, if all it's doing is vibrating the molecules more than other wavelength of light. For example, if red light is more closer to the resonant OH bond stretching vibrations, it get absorbed, but blue light is not, so it gets scattered. Don't both wavelengths wiggle the molecules, therefore transmitting energy to the molecule, albeit at different magnitudes? What makes water molecules "give back" the blue light, but "keep" the red light ? [link] [comments]  |
| Why can flies easily enter a trap but struggle to get out? Posted: 15 Jul 2018 07:34 PM PDT I saw a friend of mine post a fly trap and was wondering why the flies can get into the trap so easily, but struggle to get out? There were dozens in there dead and a dozen more alive and trapped -- unable to get out. Also what makes them fly into the liquid? Do they eventually get tired and fall in? Thanks [link] [comments]  |
| Posted: 15 Jul 2018 11:18 AM PDT |
| What causes the initial signal from our brains to be fired when we decide to move a limb? Posted: 15 Jul 2018 05:55 AM PDT When I want to move my hand, I just think about it and it works. I decide to move my hand and a signal is sent from my brain which causes my muscles to expand/contract which makes my hand move. What creates this signal in my brain? [link] [comments]  |
| What manipulates the taste and texture of different types of meats? Posted: 15 Jul 2018 05:01 PM PDT |
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