AskScience AMA Series: We mapped human transformation of Earth over the past 10,000 years and the results will surprise you! Ask us anything! |
- AskScience AMA Series: We mapped human transformation of Earth over the past 10,000 years and the results will surprise you! Ask us anything!
- Why isn't the James Webb space telescope heat shield made out of gold?
- Since in nuclear fission a very small amount of matter is converted to energy, is it Theoretically possible to create matter from energy and have we done this?
- How do population III stars fit into reionization, and how are they different from modern stars?
- Why can we still see the cosmic microwave background radiation? If it travels at the speed of light shouldn't that radiation have already passed us and that part of the sky be dark now?
- We know human body is quite full of water (~2/3) but is that ratio above average among other animals? And which animals have the most and least amount of water in their body compared to their size?
- How do blood cells get oxygen?
- Why were the first laser pointers red?
- Do we still get vitamin D from sunlights that’s passed through a window/glass?
- Why is the expansion of the universe attributed to dark matter and not just momentum from The Big Bang?
- Immunological memory exists so that our immune system can mount a proper immune response to a previously encountered antigen. Do we have a memory system for non-antigens?
- What role (if any) does heat play in general relativity?
- What does a spider’s field of view look like?
- Why should a comet have a “tail” at all? There’s no air friction. What’s making it break apart??
- Why are computers so slow at switching displays?
| Posted: 25 Oct 2019 04:00 AM PDT When did humans first begin transforming this planet? Our recent article in Science brings together more than 250 archaeologists to weigh in on this. By mapping human use of land over the past 10,000 years, we show that human transformation of Earth began much earlier than previously recognized, deepening scientific understanding of the Anthropocene, the age of humans. We're here to answer your questions about this 10,000-year history and how we mapped it.
On the AMA today are:
We are on at 1 p.m. (ET, 17 UT), ask us anything! [link] [comments]  |
| Why isn't the James Webb space telescope heat shield made out of gold? Posted: 24 Oct 2019 08:12 AM PDT The mirrors are made out of gold because it is the best reflector of infrared light. So why wouldn't the heat shield also be made out of the best reflector of infrared light? [link] [comments]  |
| Posted: 24 Oct 2019 07:39 PM PDT |
| How do population III stars fit into reionization, and how are they different from modern stars? Posted: 24 Oct 2019 07:05 PM PDT Before going into the question more, I understand that Pop III stars form in neutral, metal-free gas. What I am confused about is how this makes them different than other stars. For example, why are they capable of being so much more massive than Pop I stars? Also, during formation, is it a special case in Pop III stars that their accretion disks seem to fragment, or is this common among all protostellar systems? If this is exclusive to Pop III stars, why is that? Finally, I'm confused about how exactly they fit into the era of reionization. I understand that the light emitted from these stars will ionize the surrounding gas, but once the stars dies, does the gas not just become neutral again? How does this process begin the reionization of the universe as a whole? [link] [comments]  |
| Posted: 24 Oct 2019 05:06 PM PDT |
| Posted: 24 Oct 2019 01:39 PM PDT |
| How do blood cells get oxygen? Posted: 24 Oct 2019 04:56 PM PDT I'm going over the circulatory system for a class and was curious about how blood cells get the oxygen they need to survive. Does the oxygen they require simply diffuse into the cells when they pass through the pulmonary loop as they pick up oxygen for transport? [link] [comments]  |
| Why were the first laser pointers red? Posted: 24 Oct 2019 12:08 PM PDT Why were the first laser pointers red and why today do they only make lazer pointers in red, green, and violet. Which also happen to be end middle end of the visible light spectrum. [link] [comments]  |
| Do we still get vitamin D from sunlights that’s passed through a window/glass? Posted: 24 Oct 2019 05:46 AM PDT |
| Posted: 24 Oct 2019 05:16 AM PDT |
| Posted: 24 Oct 2019 10:13 AM PDT For example, let's say it's spring time and there is much pollen in the air. Does the immune system bind to the pollen molecules and determine it is a non-antigen every single time it encounters it, or does it mark the pollen as a non-antigen for the future? The reason I ask this is that common allergies are caused by our immune system improperly acting upon a non-antigen (they treat something like pollen as something dangerous, when it really isn't). Let's say there's a 1% chance that our body develops an allergic reaction to pollen; that means after 100 exposures it is likely that a person develops some sort of response, unless the body has determined it to be a non-antigen and can recognize it so! Is this something that happens in the body, or do we only have a memory for antigens? [link] [comments]  |
| What role (if any) does heat play in general relativity? Posted: 24 Oct 2019 03:58 PM PDT At absolute zero, molecular movement (basically) stops. Does that mean time stops for the subject molecules as well? Is temperature (or some other more direct attribute) captured as a variable in relativistic equations? [link] [comments]  |
| What does a spider’s field of view look like? Posted: 23 Oct 2019 09:18 PM PDT I've seen pictures of spiders having eyes on parts of their heads where it looks as if a fluid and connected image would not be possible. Do they see similar to say, a security set up where there are different points of view? Or does the image present itself like one very wide angled picture? Thanks! [link] [comments]  |
| Why should a comet have a “tail” at all? There’s no air friction. What’s making it break apart?? Posted: 23 Oct 2019 06:57 PM PDT |
| Why are computers so slow at switching displays? Posted: 23 Oct 2019 06:48 PM PDT While nearly every task on computers has gotten quicker and quicker, plugging into a display even on my new MacBook Pro, causes the computer to spaz out for a solid 30 seconds with windows slowly resizing, jumping around, etc., until eventually settling down and functioning normally. Why does this process take so long, and why has it seemingly not benefited from vast improvements to bus speeds, processor speeds, etc.? [link] [comments]  |
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