Why is it that even when the wind blows warm, we feel cooler? |
- Why is it that even when the wind blows warm, we feel cooler?
- What is it about a curing process of meat, drying of fruit etc. that makes the food last longer and allow you to store it unrefrigerated?
- Is there a minimal size a star can be?
- Where do all of the skeletons of marine life go?
- Are haplotype blocks never broken by recombination?
- When archeologists are looking for Paleolithic/ Neolithic artifacts how can they be sure what they’ve found is an ace head for example, rather than a triangular rock?
- How did HIV/AIDS virus originate? Was there someone like patient zero?
- How do laser thermometers detect temperatures of the surface they are pointed at?
- Why do we get hiccups?
- Do other stars have a 11 year sunspot cycle like our sun?
- Why is it the instinct for young animals to play?
- Celestial bodies are constantly in motion, but named constellations have been around at least two millennia. What is the rate of change in position for these constellations to an observer on earth?
- Can Plasma be used as a lens to focus EM radiation?
- How do iPad chargers allow more current than iPhone chargers?
- How is yaw controlled in different types of helicopters?
- How do birds whistle and make discernable notes without lips or some other way of controlling pitch, like humans?
- Are speedreading school legit or a hoax, howmany words per second can the brain actually read retaining all the information?
- How will climate change affect the Pacific Northwest (US)?
- Does having exercised in early life have an effect on losing weight later on?
| Why is it that even when the wind blows warm, we feel cooler? Posted: 18 Sep 2018 12:58 PM PDT Another example: On a warm day, if somebody blows on your face your face gets cold/chill. [link] [comments]  |
| Posted: 18 Sep 2018 09:41 PM PDT |
| Is there a minimal size a star can be? Posted: 18 Sep 2018 05:18 PM PDT I understand that stars can be massive. For example, VY Canis Majoris would fit inside Jupiter's orbit around our sun. But, what about small stars? Is there a minimal size they can be and still begin nuclear fusion? (I hope I'm asking this clearly!) Thanks, science! [link] [comments]  |
| Where do all of the skeletons of marine life go? Posted: 18 Sep 2018 06:47 PM PDT |
| Are haplotype blocks never broken by recombination? Posted: 19 Sep 2018 06:42 AM PDT Even though there are recombination hotspots, I thought recombination is in general a random event. So what enables a haplotype block to survive recombination for generations? For example the average length of a haplotype is several kilobases long. That seems a bit long to survive random recombination. Or, if a haplotype block exists today, for how many generations can you trace it back before it is broken by recombination? [link] [comments]  |
| Posted: 18 Sep 2018 07:04 PM PDT I see examples of Stone Age artifacts like axe blades, arrowheads, etc but they just look like triangular rocks. How can an archeologist tell what is a Stone Age flint tool and what is a naturally occurring object? [link] [comments]  |
| How did HIV/AIDS virus originate? Was there someone like patient zero? Posted: 19 Sep 2018 04:32 AM PDT HIV is transmitted sexually or blood transfusion or sharing needles so who was the first person carrying the HIV?Did the virus mutate from something else? If it did so, then will it mutate again and take an even more dangerous form like transmission via air? [link] [comments]  |
| How do laser thermometers detect temperatures of the surface they are pointed at? Posted: 18 Sep 2018 03:20 PM PDT |
| Posted: 18 Sep 2018 07:00 PM PDT |
| Do other stars have a 11 year sunspot cycle like our sun? Posted: 18 Sep 2018 02:22 PM PDT I was thinking about the Kepler and TESS astronomy missions; specifically, that they would have to differentiate between sun spots and transiting exoplanets. This made me wonder if enough data has been collected to research the sunspot cycle in other stars. [link] [comments]  |
| Why is it the instinct for young animals to play? Posted: 18 Sep 2018 02:57 PM PDT Why/How is this learned and why does it seemingly fade in all animals, humans included? [link] [comments]  |
| Posted: 18 Sep 2018 01:27 PM PDT Also - how might they have looked different (if at all) 200 years ago? Is there any history of astronomers noticing this and drawing conclusions before the current model was popularized? [link] [comments]  |
| Can Plasma be used as a lens to focus EM radiation? Posted: 18 Sep 2018 01:40 PM PDT Hey Everyone, I was just watching a video on Star Wars hyper drive lore and it talks about a gamma ray source emitting though a wave guide into a fusion reactor. Obviously this is high concept Scifi, but it got me thinking... If you were to take EM radiation and fire it through a spherical or lens shaped confined plasma, could it be used to focus or disperse the radiation and what would any fringe effects of some setup like this possibly be? Love you all! Edit: been thinking about it a little more and if the gamma ray waveguide acted almost like a projector through some hyperdimensional structure in the fusion reactor, could it maybe ripple spacetime? [link] [comments]  |
| How do iPad chargers allow more current than iPhone chargers? Posted: 18 Sep 2018 05:50 PM PDT The charger for an iPad allows 2100 mA (milliamps) of current. The charger for an iPhone only allows 1000 mA. This means if you plug your iPad into the charger for an iPhone it will charge much more slowly. My question is this: How are the chargers different? I already understand part of this so I'll include that part in the question. The electricity from a wall outlet is about 110 volts of alternating current (at least in the U.S.). The charger converts that to 5 volts of direct current. (Anything powered by a USB port is 5 volts.) The device has electrical resistance which determines the current. For example, if the iPad's resistance is about 2.38 ohms then it would "draw" 2100 mA of power. When we say "draw" we really mean the device would allow that much current to pass through. If the iPhone charger is also pushing 5 volts and the resistance for the iPad doesn't change then the iPhone charger must be throttled in some way. I'm sure it's a safety measure to keep the charger from getting too hot, but how does that throttling work? [link] [comments]  |
| How is yaw controlled in different types of helicopters? Posted: 18 Sep 2018 01:26 PM PDT So I think I understand how yaw is controlled in standard tail rotor helicopters and in coaxial rotor copters like the KA-50. Yaw is controlled by balancing torque with counter torque, or changing the balance of torque between two coaxial rotors. What I'm having trouble understanding is yaw control in tandem rotors like the Chinook and in synchropters like the K-MAX. According to Wikipedia tandem rotors control yaw by changing rotor pitch with each rotor on opposite sides, which creates opposite lateral motion at the front and back. In single rotor helicopters changing pitch on the left or right side creates lateral motion by causing the vehicle to roll, but since the Chinook can't roll in both directions at once, what force is causing the lateral motion that creates yaw? Also according to Wikipedia, synchropters control yaw by raising the collective on a single rotor. I'm guessing this changes the balance of torque by making one set of rotors less aerodynamic, but wouldn't this also cause the whole vehicle to fly upwards, roll in one direction, or both? Typed this on my phone during break at work so I apologise for typos/formatting. [link] [comments]  |
| Posted: 18 Sep 2018 08:59 AM PDT |
| Posted: 18 Sep 2018 11:40 AM PDT |
| How will climate change affect the Pacific Northwest (US)? Posted: 18 Sep 2018 04:13 PM PDT It's always been a dream of mine to live in southern British Colombia CA or Northern Washington US, and I would like to know if there are any predictions for significant climate change regarding this region. Particularly; will the temperatures change? Will be there be less/more rainfall? Anything else? Thanks in advance! [link] [comments]  |
| Does having exercised in early life have an effect on losing weight later on? Posted: 18 Sep 2018 10:04 AM PDT Suppose there are two people at an equal level of fitness, but one has never done sports and the other has had lots of exercise in his youth. Does the person with experience in sports get fit faster? [link] [comments]  |
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