Why do plants never get cancer? |
- Why do plants never get cancer?
- During the carboniferous period, the oxygen level was ~35%. Now it is ~21%. There is less oxygen in atmosphere now. Where is that oxygen now?
- How do scientists get neutrons for experiments?
- Why do we get ticklish?
- Why can't Dendritic cells kill HIV?
- Can we see the Milky Way?
- When performing a gravitational slingshot maneuver, does the direction the planet is rotating in relative to a spacecrafts trajectory make a difference?
- In terms of sleep-quality, is it better to dream or not dream?
- Can photons red-shift due to gravity wave losses?
- Identifying basic sedimentary rocks in the field. How can I distinguish sandstone, limestone, shale, etc with a hand lens? I'm more looking for what I should see using hand lens rather than "shale looks like sheets of gray rocks while sandstone + limestone generally won't"
- Why is the periodic table called the periodic table?
- Why does a book fall faster than a paper of the same length and breadth?
- What will happen to the gas giants once the sun becomes a white dwarf? Will they break free from the solar system? How long will they stay as gas giants?
- Why is precipitation is so scarce in the Levant region on summer being that there's plenty of heat and humidity?
- Is there a blob of particles that only loosely interact with matter at the 'bottom' of gravity wells, such as Earths?
- How is the amount of calories in a given food determined?
| Why do plants never get cancer? Posted: 28 Jun 2019 01:51 PM PDT All humans and most other animals are at risk of getting cancer during their lifetime.But why plants have the privilege of not getting this disease? I'm really impressed by most of your responses,but their is a question in my mind that is still bugging me. When a person gets really old,cancer cells would form in a certain part of his body since his DNA becomes "weaker"as he got older ,but let's say just in this case that the cancer cells can not move to other parts of his body(Metastasis )to make the situation similar to plants where cancer cells are locked in this position since they have cell walls that surround the cells. Cancer cells would still originate from different parts of his body as he gets older until tumor covers all of him and he dies. This case is theoretically possible for a human,but some trees live for thousands of years and it doesn't seem that tumors are covering all of their parts...Why? [link] [comments]  |
| Posted: 29 Jun 2019 04:14 AM PDT During the carboniferous period, the oxygen level was ~35%. Now,the level is ~21%. There was a 41.5% oxygen decrease in atmosphere. Considering the fact that the level of CO2 were always negligible - at the beginning of the carboniferous period was only 7000ppm (~0,7%),now it is ~0,04% . Where is that oxygen now? I understand that breaking down lignin was difficult and it became coal but coal is mostly carbon. This explains the fact that carbon is trapped as coal but where is that oxygen trapped now? [link] [comments]  |
| How do scientists get neutrons for experiments? Posted: 28 Jun 2019 09:04 AM PDT I'm an amateur nuclear engineer, and I want to preform an experiment with lithium fission, but I need a source of neutrons. I've heard of neutron sources like AmBe, PuBe, RaBe, etc. Are these typically used as neutron sources in experiments, and where can I get one? I can't find them online. Thanks in advance! [link] [comments]  |
| Posted: 29 Jun 2019 04:03 AM PDT |
| Why can't Dendritic cells kill HIV? Posted: 28 Jun 2019 08:47 PM PDT It is known that Dendritic Cells can engulf free floating pathogens.How is it so that they can't engulf all free floating Human immuno deficiency virus before they find a host cell (the CD4+ cell)? [link] [comments]  |
| Posted: 29 Jun 2019 02:28 AM PDT All those beautiful pics on Reddit of the Milky Way Galaxy, can they be seen by the naked eye or is that only possible through a lens? [link] [comments]  |
| Posted: 28 Jun 2019 05:23 PM PDT I've probably worded this poorly, and this might seem obvious. I read some interesting comments on a post earlier and when speaking to my friend about it we disagreed on the above statement. While I was able to find lots of information about gravitational slingshots I didn't immediately see any that explicitly mentioned the rotation direction of the planet. I thought that it was the gravitational pull of the planet that accelerated a spacecraft and it wasn't really important what direction it was rotating in. He thought that it was entirely dependant on the rotational direction of the planet and a spacecraft would have to enter its gravity in the same direction. Please can you help me clear this up. Thank you! [link] [comments]  |
| In terms of sleep-quality, is it better to dream or not dream? Posted: 28 Jun 2019 06:31 AM PDT I feel most rested after sleeping when I cannot recall my dreams upon waking, and least rested when I wake with memories of intricate, vivid dreams. Is one better than the other in terms of physical and mental rest? [link] [comments]  |
| Can photons red-shift due to gravity wave losses? Posted: 28 Jun 2019 06:10 PM PDT I have heard photons have momentum, and with it an effect on gravity. If large masses slowly lose speed due to radiating gravity waves, could photons be affected similarly over long enough distances? Would it change our estimates of galaxy speeds? Edits: For more clarification, I am asking about the red-shift due to gravity waves emitted by the photons themselves, not about normal red-shift from climbing out gravity wells. [link] [comments]  |
| Posted: 28 Jun 2019 05:55 AM PDT |
| Why is the periodic table called the periodic table? Posted: 28 Jun 2019 05:24 AM PDT |
| Why does a book fall faster than a paper of the same length and breadth? Posted: 28 Jun 2019 05:07 PM PDT |
| Posted: 28 Jun 2019 12:46 AM PDT There are a lot of sources out there describing what would happen to the solar system ones the sun becomes a red giant. Mercury, Venus, and Earth would be swallowed by the sun, Europa, Enceladus, Titan etc would probably have better conditions for life, Saturn would lose its rings etc. But what I don't find a lot of sources in is what would happen to the gas giants once the sun passes its red giant phase. Would its gravity still be strong enough to keep the gas giants in the solar system? When would our little neighborhood in the milky way cease to exist? I guess the reason why there aren't a lot of sources on this one is because it's too far ahead in time to theorize a plausible scenario. But are there any vague or general theories out there? [link] [comments]  |
| Posted: 27 Jun 2019 11:31 PM PDT |
| Posted: 27 Jun 2019 08:30 PM PDT I know there are particles out there that don't have very many interactions with the EM field and the Strong field, like Neutrinos, which are more or less only affected by gravity. I know Neutrinos are very short-lived, but if they were longer, they would collect eventually at the bottom of gravity wells, in the center of massive objects. Is it possible that there are bunch of exotic particles at the center of the earth, the sun, etc? If so, is there any way we could even know this? Could an increase in gravity from these particles be distinguished from just a heavier core? [link] [comments]  |
| How is the amount of calories in a given food determined? Posted: 27 Jun 2019 08:15 PM PDT |
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