If you were a human floating towards the sun, at what distance from the sun would you feel an Earth-like temperature? |
- If you were a human floating towards the sun, at what distance from the sun would you feel an Earth-like temperature?
- Any evidence for fertile hybrid origin for *Homo sapiens* ?
- When does the body produce Melanin?
- Why does rain fall as individual droplets and not sheets or continuous lines?
- Why do dogs' paws develop sooner than other parts of their bodies - leading to puppies with over-sized paws?
- How is radiometric dating reliable over billions of years?
- What’s the most powerful form of erosion?
- Why do fans sound like white noise?
- Why do 45% of people have Hazel colored eyes? In other words, why is hazel the most abundant eye color?
- Does sweating become useless when the air is above body temperature?
- Did the 'strength' of seasons vary in the deep prehistory of the Earth?
- How do nocturnal animals behave in regions with 24 hours of daylight during parts of the year?
- Are there ways or examples of life existing without reproduction?
- What is the chemical reaction between kitty litter and motor oil?
- Is there audible thunder on the other planets of the solar system and if so, how loud does it get?
- What causes the crystalline like oxidation on this stainless steel weld?
- During the times of the supercontinents, could there have been other, separate land masses that simply no longer exist?
- Does natural selection select for imperfect DNA replication?
- How much does air temperature effect a forest fire?
- Why does the sun turn a dark red color during large fires? (for example the wild fires in SoCal) Also, what makes the sun + sky appear different colors during a sunset?
- Does altered weight distribution make a coin unfair? And can we infer the level of unfairness of said coin simply by knowing its weight distribution?
- Do objects in space no matter what the weight, move at the Same speed if the same momentum force is applied?
- Cover a Condenser Coil: Get More Liquid R404A in Sight Glass, Not Less. Why?
| Posted: 09 Aug 2018 09:23 AM PDT |
| Any evidence for fertile hybrid origin for *Homo sapiens* ? Posted: 10 Aug 2018 05:53 AM PDT There is increasing evidence being reported in the scientific literature of fertile hybrids forming new species for both plants and animals. Orchids of the genera Epidendrum and Ophrys, rodents Ctenomys, Frogs Phyllomedusa, Guenon monkeys, to name a few examples. A common theme reported is that fertile hybrid formation seems to be associated with ecotones, zones of overlap in species that once had ranges completely separated. Fertile hybrids can result where there is a wide difference in number of chromosomes between parent species. This leads up to my OP question, is there any evidence to suggest that modern humans, Homo sapiens, has origin as a fertile hybrid species of two proto-human Hominid species that once had allopatric distribution that over time came to overlap, I assume in Afirica ? [link] [comments]  |
| When does the body produce Melanin? Posted: 10 Aug 2018 06:45 AM PDT When is the body producing melanin or for the matter is there even a specific time for that? Does Melanin production occur only at a specific time like for example how some body functions only occur while sleeping or is it a process that activates as soon as sunlight hits the skin? Sorry I know this an kinda an uncommon question, maybe even dumb, but I'm really want to know [link] [comments]  |
| Why does rain fall as individual droplets and not sheets or continuous lines? Posted: 10 Aug 2018 05:23 AM PDT |
| Posted: 09 Aug 2018 05:53 PM PDT |
| How is radiometric dating reliable over billions of years? Posted: 09 Aug 2018 07:01 PM PDT I've took chemistry earlier this year, and we had a segment on radiometric dating. One of my friends (who shares the same class) is very religious, and doesn't take science very seriously. When the topic came up at lunch, he expressed serious doubts over whether the decay rates where truly constant. I then told him that scientist had put several radioactive materials under intense conditions (change in temperature, pressure, etc) and that they didn't change. He then told me that we can't "extrapolate from this to deduce they are correct over billions of years". I later googled what he said, and it verbatim came from an anti-science religious website. What would I say to him to show that we could take that information? One answer I heard was that Radiometric dating was concordant with other dating methods. But I would like some additional help with this. [link] [comments]  |
| What’s the most powerful form of erosion? Posted: 10 Aug 2018 06:26 AM PDT Which is most effective at eroding things in nature? Water, salt water, wind? Where is erosion most prevalent and what natural materials are best resistant to erosion? [link] [comments]  |
| Why do fans sound like white noise? Posted: 09 Aug 2018 01:06 PM PDT |
| Posted: 09 Aug 2018 07:18 PM PDT |
| Does sweating become useless when the air is above body temperature? Posted: 09 Aug 2018 01:05 PM PDT So if sweat wicks away heat from our warmer body to the colder air then wouldn't that mean that if the air was above our body's temperature that sweating would make our body even hotter? [link] [comments]  |
| Did the 'strength' of seasons vary in the deep prehistory of the Earth? Posted: 09 Aug 2018 06:34 PM PDT Seasonal variations in temperature, precipitation and other weather/climatic effects are affected by changes in the Earth's axial tilt and orbital eccentricity, which themselves are known to follow regular cycles with periods in the thousands to hundreds of thousands of years. But if we look averaged over longer times scales and further back in time, say tens and hundreds of millions of years, what trends occurred with regard to the strength of seasonality? For example, was the mean of the difference between summer and winter temperatures less or greater than the present day for a given latitude, and if so why? Would an observer at the latitude of today's temperate reasons find the season variation smaller or greater than today? Would such differences if they existed be down to changes in Earth's orbital parameters (either irregular, or regular but with timescales in the tens of millions of years), or other factors? (This question was inspired by a comment in Paleobiology 29(1), 2003, pp. 84-104, that says "concomitant with cooling and increased seasonality during the Tertiary", my emphasis) [link] [comments]  |
| How do nocturnal animals behave in regions with 24 hours of daylight during parts of the year? Posted: 09 Aug 2018 11:43 AM PDT |
| Are there ways or examples of life existing without reproduction? Posted: 09 Aug 2018 09:25 AM PDT |
| What is the chemical reaction between kitty litter and motor oil? Posted: 09 Aug 2018 09:22 AM PDT I was unaware just how fast kitty litter cleans oil up until yesterday. So i thought I'd ask. I guess the question is more like " What is happening when kitty litter absorbs oil?" [link] [comments]  |
| Is there audible thunder on the other planets of the solar system and if so, how loud does it get? Posted: 09 Aug 2018 09:08 AM PDT |
| What causes the crystalline like oxidation on this stainless steel weld? Posted: 09 Aug 2018 02:30 PM PDT Picture here. This is a 316L hotwire GTAW weld made using orbital welding. I can see that some of the "shards" have already taken shape while under argon atmosphere, they are just a different shade of silver. [link] [comments]  |
| Posted: 09 Aug 2018 08:45 AM PDT Looking at this amazing interactive map with the kids and referencing the list of supercontinents on Wikipedia, the earth is often shown as having one giant land mass and one giant, uninterrupted ocean. Nothing else. During the times when we know those supercontinents existed, is it still possible there were other, smaller land masses? [link] [comments]  |
| Does natural selection select for imperfect DNA replication? Posted: 09 Aug 2018 09:25 AM PDT In order for evolution to occur, there naturally must be mutations in DNA, which can not occur if DNA replication were flawless and DNA were unable to be damaged. But on the other hand, excessive mutation can also lead to a plethora of issues. So theoretically with excessively perfect DNA replication and preservation, a species would be unable to evolve and therefore eventually succumb to a changing environment, whereas a species with horrendous replication and preservation would be harmed by the mutations themselves. Does this mean that natural selection therefore selects for a system that preserves and replicates DNA only to some imperfect extent rather than increasingly more accurately and safely? [link] [comments]  |
| How much does air temperature effect a forest fire? Posted: 09 Aug 2018 01:08 PM PDT |
| Posted: 09 Aug 2018 08:22 PM PDT |
| Posted: 09 Aug 2018 09:22 AM PDT |
| Posted: 09 Aug 2018 07:20 PM PDT Example: one ton cube vs. 100kg cube. Both pushed with the same force. Would they move at equal speeds because weight (and maybe friction?) in space wouldn't matter? [link] [comments]  |
| Cover a Condenser Coil: Get More Liquid R404A in Sight Glass, Not Less. Why? Posted: 09 Aug 2018 07:14 PM PDT Specifically, when performing a quick refrigerant level check in low ambient temperatures the procedure is to cover the condenser coil to maintain 300 psi discharge pressure, equivalent to 100°F ambient. Then check receiver tank sight glass for ball float. If the refrigerant is not giving up the energy to the air, why is it changing state? [link] [comments]  |
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