When did people realize that a whip crack was breaking the sound barrier? What did people think was causing that sound before then? |
- When did people realize that a whip crack was breaking the sound barrier? What did people think was causing that sound before then?
- Does an octopus have a dominant tentacle?
- Do we permanently blind deep sea creatures when we point spotlights at them in their natural habitat?
- If I stick my head out of a car window at 65 mph and try to look directly ahead I’m effectively blinded by the air rushing passed my eyes. How does a cheetah see and track prey when running at top speed?
- What was the Amazon like when the Sahara was green?
- How do computers allocate resources?
- In the event of an heart attack why is it an either or decision between thrombolysis and angioplasty? Why can't both be done at the same time or successively?
- When you recieve a blood donation, what happens to the DNA of the blood you recieved?
- Why do Tetanus shots hurt more than flu shots?
- If I have two devices (a remote and a flashlight, or whatever) each using two common AA/AAA/D batteries, but only one of them has 100% remaining useful battery power and the other one has 0%... Can I theoretically swap one battery in each device and increase the power of each device to 50% life?
- How do people who study fluid mechanics get accurate positional data on things like air and water?
- On a calculator, Square root of -1 gives you a math error, but -1 to the power of 1/2 gives you -1. Why is that?
- Why does your mouth water when you're about to throw up? Wouldnt the increased saliva make nausea worse?
- Is all space expanding the same everywhere?
- Is tree bark an ancestral trait in Gymnosperms and Angiosperms or did both species evolve it separately?
- why do hiccups occur?
- Since there is a limited amount of energy in the Universe, isn't there a maximum max temperature?
- How did where the land meets the sea in Ireland result in cliffs and not beaches like everywhere else?
- I know that through evolution one species can become another species, but at what point does one species turn into another?
| Posted: 26 Mar 2019 02:07 AM PDT |
| Does an octopus have a dominant tentacle? Posted: 25 Mar 2019 02:52 PM PDT |
| Posted: 25 Mar 2019 03:46 PM PDT Basically as above. Got me thinking whilst watching Blue Planet. Some creatures appear not to have 'eyes' (at least in the classical sense), so perhaps they use other senses for survival, navigation, etc, and therefore aren't affected. On the other hand, surely shining a light from an ROV or manned submersible, even of low luminosity/brightness/whatever, at creatures who possess some kind of vision would immediately blind them and thus reduce their chances of survival to zero? [link] [comments]  |
| Posted: 26 Mar 2019 07:33 AM PDT |
| What was the Amazon like when the Sahara was green? Posted: 25 Mar 2019 02:31 PM PDT So the Amazon gets a lot of its nutrients from Saharan dust. I recall, however, that the Sahara undergoes periodic greening periods due to climatic changes, when dust would presumably be prevented from being kicked up by vegetation and relatively damp conditions. What happens to the Amazon during these periods? [link] [comments]  |
| How do computers allocate resources? Posted: 26 Mar 2019 02:08 AM PDT If a computer is doing something in the background, say rendering video, and something in the foreground, say browsing the web, and the web browsing is lagging, why doesn't it automatically redirect resources to ensure that the foreground task is smooth, and devote only the excess resources to the background task? Or does it? How do computers allocate resources? [link] [comments]  |
| Posted: 26 Mar 2019 04:07 AM PDT Non-native English speaker here. From what I understand, in the event of an ongoing heart attack the doctors must choose between thrombolysis or an angioplasty with stenting/PCI (PCI and Angioplasty are the same thing right?). But both cannot be done. So suppose someone is very far away from a hospital with angioplasty facilities. Why can't they be given thrombolysis first to save heart muscle and then when they reach the hospital after an hour they are treated with angioplasty with stents? Why does it have to be an either or decision? [link] [comments]  |
| When you recieve a blood donation, what happens to the DNA of the blood you recieved? Posted: 25 Mar 2019 01:41 PM PDT |
| Why do Tetanus shots hurt more than flu shots? Posted: 26 Mar 2019 07:31 AM PDT I get flu shots every year and seldom feel the shot as more than just a small jab and never feel any discomfort at the injection site afterward. I got a Tetanus (DTAP) shot yesterday and holy fuck does my arm hurt! The shot hurt going in and my deltoid hurts today. They appeared to be the same volume of "stuff" so I can't chalk it up to a larger injection volume. Any ideas? [link] [comments]  |
| Posted: 25 Mar 2019 03:59 PM PDT |
| How do people who study fluid mechanics get accurate positional data on things like air and water? Posted: 25 Mar 2019 03:21 PM PDT I know there are things like pressure and motion sensors exist but I don't understand how someone might track the general flow of water in a tank. [link] [comments]  |
| Posted: 25 Mar 2019 07:19 PM PDT Root of 9 is 3, 9 to the power of 1/2 is 3. Root of 1 is 1, 1 to the power of 1/2 is 1. Root of -1 gives you an error, -1 to the power of 1/2 is -1. How come? [link] [comments]  |
| Posted: 25 Mar 2019 12:40 PM PDT |
| Is all space expanding the same everywhere? Posted: 25 Mar 2019 10:03 AM PDT Is a cubic foot of interstellar space expanding the same as a cubic foot of intergalactic space? [link] [comments]  |
| Posted: 25 Mar 2019 08:35 AM PDT I'm more of a human anatomy and health sciences fella but this made me curious. In my biology class we're on plant physiology. Gymnosperms and angiosperms are both seed bearing plants and both contain species which have bark. All gymnosperms, to my limited knowledge, have bark while there are many angiosperm trees as well. However, many angiosperms don't have bark. Did angiosperms evolve away from bark and to a fleshier stalk? [link] [comments]  |
| Posted: 25 Mar 2019 03:11 PM PDT |
| Since there is a limited amount of energy in the Universe, isn't there a maximum max temperature? Posted: 25 Mar 2019 11:05 AM PDT |
| Posted: 25 Mar 2019 10:04 AM PDT |
| Posted: 25 Mar 2019 12:20 PM PDT I also don't know what flair to put, so I put chemistry [link] [comments]  |
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