How did ancient people keep stored water supplies such as cisterns safe to drink? |
- How did ancient people keep stored water supplies such as cisterns safe to drink?
- Do citizen science programs like Zooniverse contribute to scientific research to a meaningful extent?
- Why does ions like iron or copper have “varying charge” so that there’s iron(3) and iron(2)?
- Can insects fly in the rain?
- Why is the average height of humans increasing over time?
- When you leave a carbonated drink to sit for a while after being shaken to avoid it fizzing over, what is actually happening here?
- How acutely aware are animals of mutations?
- What makes things soluble?
- Is there any reason why the arctic is an ocean surrounded by continents and the antarctic is a continent surrounded by oceans, and both pretty much centered, other than coincidence?
- If Rheumatoid arthritis (or really any autoimmune disease) is caused by your immune system attacking specific tissues/cells, then why does doing things that would lower your immune system (such as overexertion, poor sleep, or stress) cause you to have a "flare up"?
| How did ancient people keep stored water supplies such as cisterns safe to drink? Posted: 13 Nov 2019 07:38 PM PST This has bothered me for quite some time. I get that a lot of people died of diseases and such. Standing, stagnant water allways looks so disgusting. Was the ones who lived immune systems so much better or were they able to keep the cistern free of diseases using plants or something? [link] [comments]  |
| Posted: 13 Nov 2019 09:43 PM PST Recently came across a program called Galaxy Zoo (hence the astronomy flair) and I am just wondering how useful are these types of things to scientists? [link] [comments]  |
| Why does ions like iron or copper have “varying charge” so that there’s iron(3) and iron(2)? Posted: 14 Nov 2019 01:08 AM PST |
| Posted: 13 Nov 2019 01:01 PM PST |
| Why is the average height of humans increasing over time? Posted: 13 Nov 2019 12:22 AM PST Napoleon, who was known for his short stature, was average height in his day. During the American Revolution, the average male height was 5'6. Does this mean that taller people are "fitter" to survive? [link] [comments]  |
| Posted: 12 Nov 2019 09:25 PM PST |
| How acutely aware are animals of mutations? Posted: 12 Nov 2019 09:50 PM PST So there was recently a picture on r/all of a dog with a small nonfunctional tail on its forehead. So it got me wondering exactly how aware are animals of mutations like that? With the example above would the dog be shunned? Is it with as visceral a reaction as humans in the old days? Do they perhaps only care about mutations that affect ability or do they care about aesthetic mutations as well? [link] [comments]  |
| Posted: 13 Nov 2019 12:52 AM PST |
| Posted: 12 Nov 2019 07:41 PM PST |
| Posted: 12 Nov 2019 01:50 PM PST Autoimmune diseases are caused by your immune system developing antibodies to specific tissue's in your body. So, how is it that in situations where your immune system is naturally lower, like during periods of high stress, lack of sleep, and excess exercise, your symptoms worsen? Is it simply a matter of interrupting some sort of war between regenerating cells and attacking antibodies? [link] [comments]  |
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