Sometimes when we rub our eyes too hard you lose your vision for a second and then it comes back gradually. Why is that? |
- Sometimes when we rub our eyes too hard you lose your vision for a second and then it comes back gradually. Why is that?
- Quick question, how does a rocket engine like Merlin 1D NOT melt the rocket's nozzle?
- Why do many various neurotransmitters exist if nerve signals are binary?
- If the lungs in land vertebrates evolved from the gas bladder, what did the gills evolve into?
- How do modern ship anchors work? If they get stuck on the sea bed how do we free them?
- Why diseases like hepatitis, measles still exist even there is the vaccine?
- Does the human body absorb Vitamin D from the sun via the eyes or skin?
| Posted: 05 Sep 2020 10:42 PM PDT |
| Quick question, how does a rocket engine like Merlin 1D NOT melt the rocket's nozzle? Posted: 05 Sep 2020 10:58 AM PDT What kind of material withstands so much heat and energy from that kind of rocket engine? How can they be reusable? I saw a testing video from SpaceX that lasted 3 mins and couldn't stop wondering how is it that the nozzle of the engine didn't melt away. [link] [comments]  |
| Why do many various neurotransmitters exist if nerve signals are binary? Posted: 05 Sep 2020 10:22 PM PDT As far as I know neurotransmitters are only released, bound to receptors and reuptaken in the synpatic cleft. I that is the case, then what's the point of multiple neurotransmitter types if chemical signal is going to only be translated into a binary electric signal that is 1 (excitation of the membrane), while none is 0 (resting membrane potential)? For me, in my limited knowledge, it appears as if their existance is useless since electrical signals alone or just a single neutrotransmitter type would suffice, unless neurotransmitters were released into the intracellural space and all neurons in an area of the brain with specific receptors would pick them up, which isn't a case in models I can find on the internet or in books. I know I am wrong but having asked many highschool teachers noone was able to answer this question to me years ago. Can anyone explain this to me in best detail possible? [link] [comments]  |
| If the lungs in land vertebrates evolved from the gas bladder, what did the gills evolve into? Posted: 05 Sep 2020 04:28 PM PDT |
| How do modern ship anchors work? If they get stuck on the sea bed how do we free them? Posted: 05 Sep 2020 03:16 PM PDT How do modern sea anchors work? Do they hook onto rocks? Sink into the sea bed? Just weight the ship down? What happens if they get stuck? [link] [comments]  |
| Why diseases like hepatitis, measles still exist even there is the vaccine? Posted: 05 Sep 2020 09:32 AM PDT The smallpox vaccine was developed by Edward Jenner, in 1796. After many years, WHO issued its official declaration that 'the world and all its peoples have won freedom from smallpox' in May 1980. We also have vaccines against some viruses and bacterias. Why cannot we eliminate them? [link] [comments]  |
| Does the human body absorb Vitamin D from the sun via the eyes or skin? Posted: 04 Sep 2020 03:22 PM PDT Keep finding conflicting answers on this online Can you absorb vitamin D from sun fully clothed head to toe but keeping your eyes open on a sunny day (absorbed through eyes) Conversely, could you absorb vitamin D from the sun while laying out tanning but with your eyes closed (absorbed through skin) I always thought it was the latter but I was recently told otherwise and I haven't been able to find a consistent answer online [link] [comments]  |
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