Do tattoos protect the skin from sun damage? |
- Do tattoos protect the skin from sun damage?
- Is There a 100% Reflective Surface?
- If the atmosphere was twice as dense, would fluctuations in weather be more or less severe?
- What exactly is a photon?
- How is negative nuclear binding energy (BE/A) possible?
- Can an object become a black hole by moving fast enough?
- What's so special about Earth's axial tilt of 21° 1/2 degrees?
- When I eat seafood or other things cooked whole (lobsters, octopus, crabs), why can't I identify any organs?
- Where do courtship rituals among birds come from and more specifically how are they passed along from generation to generation?
- Would it be possible to build a large double slit experiment to examine the behavior of gravitational waves? If so, would that be proof that gravitons exist?
- How were the ancestors of modern birds able to survive the mass extinctions that killed off the dinosaurs?
- How far back do infectious diseases go in prehistory?
- Why is magnetic inequivalence not a problem in 13C NMR?
- Why do molecules tend towards lower potential energy?
- How large does a piece of land have to be before it is no longer considered an island?
- Why is iron-oxide considered a ceramic and not a metal?
- How Doesn't Earth Get Pulled Into The Sun?
- Do some people heal faster than others? Bones, cuts, etc.. Assuming the same treatment of injury?
- What are selectable markers? My book has confused me. How are they used to identify among recombinants|non-recombinants and transformants|non-transformants?
- What happens if a quark falls into an event horizon?
- Why does the launch of a geostationary satellite have a launch window?
- How does the Einstein-Szilard refrigerator work?
- Can there be an event horizon inside neutron stars?
- Do gravitational waves play a role in the expansion of space?
| Do tattoos protect the skin from sun damage? Posted: 26 Feb 2016 03:39 PM PST |
| Is There a 100% Reflective Surface? Posted: 26 Feb 2016 06:27 PM PST Mirrors don't reflect 100% light. Is there any surface that does? I think it'd be impossible for such a thing to exist though. Prove me wrong! (or not) [link] [comments]  |
| If the atmosphere was twice as dense, would fluctuations in weather be more or less severe? Posted: 26 Feb 2016 06:49 PM PST All other things (including gas composition) being equal, how would a denser atmosphere affect the weather and climate? [link] [comments]  |
| Posted: 26 Feb 2016 07:22 PM PST I'm a bit embarrassed to ask this question. I sort of know what photons do but not exactly what they are. Where do they come from? How are they created and what particles are they made up of? [link] [comments]  |
| How is negative nuclear binding energy (BE/A) possible? Posted: 26 Feb 2016 08:10 PM PST I was browsing the Table of Nuclides and I noticed that a select few nuclei, mostly extremely unstable ones like Lithium-3 and Boron-6, had a negative BE/A. From what I understand, this shouldn't be possible. Binding energy is the mass/energy lost when nucleons bind together in a nucleus - how can this value be negative? Wouldn't that mean that the nucleus actually has more energy than the separate particles? [link] [comments]  |
| Can an object become a black hole by moving fast enough? Posted: 27 Feb 2016 03:25 AM PST this week in school we have been learning about special relativity and we learnt that an objects mass increases as its speed approaches c. Does this mean there would be a point where its mass is large enough that it could become a black hole? [link] [comments]  |
| What's so special about Earth's axial tilt of 21° 1/2 degrees? Posted: 26 Feb 2016 06:33 PM PST I understand that Earth's tilt of 21° 1/2 influences a lot the dynamic of seasons around the whole globe. But... How different would it if it was a smaller angle? What about a wider angle? [link] [comments]  |
| Posted: 26 Feb 2016 01:33 PM PST |
| Posted: 26 Feb 2016 10:19 PM PST For example, I recently read that before copulation a male Kingfisher presents a fish head-first to the female, so that she can swallow it without choking on the fins and scales. Also, courtship feeding among Hawfinches is at times totally ritualised, so that although their bills meet, no food passes between them. Other examples include Flamingos who, when choosing a mate, dance in a big group. They stretch their necks and flip their heads back and forth while taking tiny, mincing steps or the series of vigorous chases that begin when a female wren entices a male. Clearly "nature" cannot account wholly for this. Thus, my question is, how do these rituals develop and how are the intricacies of these such rituals passed on from generation to generation? [link] [comments]  |
| Posted: 27 Feb 2016 04:43 AM PST |
| Posted: 26 Feb 2016 03:23 PM PST I know very little about the subject other than I kind of remember that the first sort of mammalian creatures were often able to survive by burrowing underground and/or having fur that kept them warm during the ice age. Is there any truth to this? How did birds survive? [link] [comments]  |
| How far back do infectious diseases go in prehistory? Posted: 26 Feb 2016 09:20 PM PST Not as in, prehistoric human history. What I mean is, how far back do diseases like influenza go? Did dinosaurs have something similar to bird flu, for example? Were multicellular creatures always being attacked by diseases? [link] [comments]  |
| Why is magnetic inequivalence not a problem in 13C NMR? Posted: 27 Feb 2016 04:03 AM PST In 1H NMR I've been told coupling to magnetically inequivalent carbons isnt considered due to carbons low RA, but why is it not an issue to consider in 13C spectra? [link] [comments]  |
| Why do molecules tend towards lower potential energy? Posted: 27 Feb 2016 01:30 AM PST The whole reason chemicals react is to be at a lower state of potential energy. Why is it this way? What's so special about having less potential energy? [link] [comments]  |
| How large does a piece of land have to be before it is no longer considered an island? Posted: 26 Feb 2016 01:00 PM PST Aren't all of the continents just huge islands? Where is the cutoff? [link] [comments]  |
| Why is iron-oxide considered a ceramic and not a metal? Posted: 27 Feb 2016 03:22 AM PST Is it because of its mechanical/physical properties? Or is there something else that "makes" it a ceramic? Thanks in advance! [link] [comments]  |
| How Doesn't Earth Get Pulled Into The Sun? Posted: 26 Feb 2016 07:03 PM PST Now, I did search for the answer to this question. I got it. There are some things I still don't understand though: -How come the earth get into such a perfect stabilization? -Is it really this much stable? -Assuming there IS some air in space, doesn't the earth get slowed down very slowly? (With very slowly I mean INSANELY slowly) [link] [comments]  |
| Do some people heal faster than others? Bones, cuts, etc.. Assuming the same treatment of injury? Posted: 26 Feb 2016 03:42 PM PST |
| Posted: 27 Feb 2016 12:15 AM PST |
| What happens if a quark falls into an event horizon? Posted: 26 Feb 2016 12:25 PM PST To clarify the question, if one pulls apart two quarks they form two more as quarks never go solo. (As far as I know, of course) What would happen if, when pulling two quarks apart but before more quarks are formed, one of them fell into the event horizon of a black hole? [link] [comments]  |
| Why does the launch of a geostationary satellite have a launch window? Posted: 26 Feb 2016 12:32 PM PST While watching the scrubbed SES-9 launch the other night this occurred to me. If the ultimate position of the craft is relative to the launch site why would there be time restrictions of the launch? [link] [comments]  |
| How does the Einstein-Szilard refrigerator work? Posted: 26 Feb 2016 01:05 PM PST Can someone please explain the cooling cycle of the Einstein-Szilard refrigerator? From this diagram, I understand that heat is applied to chamber 29 (the generator), but I quickly lose the thread of which gasses or liquids are forced where, and which phase changes happen where, and whether those phase changes are used to absorb/release heat, or to generate the pressures that operate the system. [link] [comments]  |
| Can there be an event horizon inside neutron stars? Posted: 27 Feb 2016 03:48 AM PST Is there even that huge of a difference between blackholes and neutron stars? Aren't black holes just really dense neutron stars where the event horizon is larger than the star? [link] [comments]  |
| Do gravitational waves play a role in the expansion of space? Posted: 26 Feb 2016 03:35 PM PST With all the recent hoopla over the detection of gravitational waves, along with countless visuals of the curvature of space-time, my poor lil human brain got to thinkin. I want to know what effect (if any) gravitational waves and the subsequent curvature of space-time have on the overall size of our ever expanding universe. I picked up a quote from this article: "Currently, we believe [the driving force behind the expansion of the universe is] mostly momentum left over from the Big Bang, and the force of dark energy will be accelerating this expansion. Forever." This would suggest that gravity and the mass of objects play no role, but I can't help but think that they do, and I look forward to someone more well-learned than I explaining why I'm wrong! For this thought experiment I imagine space to be a sheet of plastic wrap. A massive object comes along and sits in the center of the sheet, leaving an indentation. Due to dark energy, (or maybe just the propensity of the universe to flatten? Is that a thing?) the indentation is forced back to it's original state, pushing the space around it out in all directions. Just like if you were to pull an indentation out of plastic wrap! Thanks for swiftly pointing out the flaws in my logic! I look forward to your responses! :D [link] [comments]  |
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