How do we know what dinosaurs look like? |
- How do we know what dinosaurs look like?
- Questions about black-hole mergers?
- Would solar systems with young stars have more radioactive isotopes?
- How do we know How much lightyears a star is away from us?
- If gravitons are extremely hard to detect if they’re real, is there any other way to experimentally verify their existence other than direct observation?
- Why are our ring fingers less dexterous than other fingers?
- Can entangled photons from spontaneous parametric down-conversion (SPDC) be generated without a UV pump laser? Can other wavelengths be used? Would specific crystals and angles be required?
- Where does fluid that gets 'locked' into your ear go?
- Exoplanets - is it lucky to find one?
- How is a stamped hologram on a credit card different from other holograms, such that the image can be cut in half?
- What’s the mechanism of muscle memory? Will cut and healed muscle keep its memory?
- Atoms have roughly the same number of protons and neutrons. How much of a coincidence is that?
- Does every known animal require sleep?
- Is vision universally optimal or optimal for us?
- Will a car accelerate quicker driving with the rotation of the earth or slower going against the rotation of the earth or does it have no effect?
- When we do maths, what goes on in the neurons in our brains?
- Why do things like laughing really hard and yawning make your eyes water?
| How do we know what dinosaurs look like? Posted: 08 Sep 2018 09:50 AM PDT Furthermore, how can scientist tell anything about the dinosaurs beyond the bones? Like skin texture and sounds. [link] [comments]  |
| Questions about black-hole mergers? Posted: 08 Sep 2018 03:59 AM PDT As infalling gravitational singularities orbit each other faster and faster around a certain point, they produce waves that we've measured: https://www.youtube.com/watch?v=TWqhUANNFXw I was wondering what sort of geodesic they form in the microseconds before merger...as the event horizons draw nearer and pull space-time between them...is it a sort of torus, or elongated sphere? What would happen to certain particles, or even photons, trapped between them moving in an insanely fast figure 8; would they be accelerated out in escape velocities just before the merge? Does that generate a sort of 'radio blast' that would follow millions of years after we detected the gravity wave due to redshift? [link] [comments]  |
| Would solar systems with young stars have more radioactive isotopes? Posted: 08 Sep 2018 10:02 AM PDT I was just thinking about how long it took for complex life on our planet to form. I had the thought that with more radioactivity from isotopes there would be more mutations which would make it difficult for multicellular organisms to reproduce without passing on mutations. Like if we seeded life in young solar systems organisms with diploid cells would be more resilient than haploid bacteria at least but I assume there is a sweet spot in how much radioactivity is needed for complex life to thrive over millions and millions of years. I haven't taken any advanced science classes yet but am I wrong in my understanding? [link] [comments]  |
| How do we know How much lightyears a star is away from us? Posted: 09 Sep 2018 01:21 AM PDT Even weirder: How do we even know What They are Made of and How hot They are and all that kind of stuff? [link] [comments]  |
| Posted: 09 Sep 2018 02:52 AM PDT |
| Why are our ring fingers less dexterous than other fingers? Posted: 08 Sep 2018 11:24 AM PDT We can move fingers like our pointer finger and pinky pretty much independently from other fingers. That isn't the case with our ring fingers. Why is that? [link] [comments]  |
| Posted: 09 Sep 2018 01:08 AM PDT So I'm very new to nonlinear optics and I discovered that using UB lasers and either barium borate (BBO) or potassium dihydrogenphosphate (KDP) crystals one can create entangled photons via the process of spontaneous parametric down-conversion. My question is, would this also be possible with other laser wavelengths? I don't really see why not in principle, though different crystals may be necessary? If you can tell me more about this or point me to some reading material, that would be greatly appreciated :) ! [link] [comments]  |
| Where does fluid that gets 'locked' into your ear go? Posted: 08 Sep 2018 04:24 AM PDT I've been using ear drops to clear wax in my ear and sometimes the drops disappear for more than a day before they come trickling out. Where have they gone? They can't get beyond the ear drum can they? [link] [comments]  |
| Exoplanets - is it lucky to find one? Posted: 08 Sep 2018 11:01 AM PDT I know that as of March this year, over 2,300 confirmed exoplanets have been discovered, but considering the methods by which they're discovered, surely we're very lucky to find any at all. Transits of Venus arguably happen every 243 years, and aren't transits exactly how we discover exoplanets? Or is there another way we can search for them that doesn't rely on the exoplanet placing itself between its host star and us? [link] [comments]  |
| Posted: 08 Sep 2018 06:19 PM PDT Through reading about holograms, I have learned that a hologram cut in half should show the whole image, but through a more limited perspective. But this is not how the hologram on my credit card behaved when I cut it in half. I just got half of the image, as you would with a photograph. Why would this happen with this sort of hologram and not with others? Thanks. [link] [comments]  |
| What’s the mechanism of muscle memory? Will cut and healed muscle keep its memory? Posted: 08 Sep 2018 08:59 AM PDT |
| Atoms have roughly the same number of protons and neutrons. How much of a coincidence is that? Posted: 08 Sep 2018 11:01 AM PDT |
| Does every known animal require sleep? Posted: 08 Sep 2018 01:53 AM PDT |
| Is vision universally optimal or optimal for us? Posted: 08 Sep 2018 01:47 AM PDT So the "visual spectrum" for humans is 700-400 ish nm light. I know certain insects see in the ultraviolet band as well. I would assume some animals see somewhat lower into the infrared. My question is, what makes that narrow portion of thr em spectrum optimal? Is it optimal? Or did it evolve because other life interacted with that band and so early photoreceptors evolved to sense it? Would it be conceivable that some alien species sees in microwaves, for instance and has named small slices of that the way we name colors? So for them our visual spectrum would be lumped in with the "infra red" or "radio" bands? [link] [comments]  |
| Posted: 08 Sep 2018 05:26 AM PDT |
| When we do maths, what goes on in the neurons in our brains? Posted: 08 Sep 2018 04:28 AM PDT I believe computers have transistors that directly input and output answers when doing maths like addition or multiplication, but what goes on in our neurons when we do maths that makes us much slower than computers? [link] [comments]  |
| Why do things like laughing really hard and yawning make your eyes water? Posted: 07 Sep 2018 10:16 PM PDT |
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