Do animals have a sense of humour? |
- Do animals have a sense of humour?
- My parents told me phones and tech emit dangerous radiation, is it true?
- Why do physicists continue to treat gravity as a fundamental force when we know it's not a true force but rather the result of the curvature of space-time?
- How are movies fipmed in 16:9 transformed into an old TV format without distortion?
- Could a fusion reactor use any element with an atomic number lower than Iron as a source of fuel?
- Why exactly do litmus change their color?
- Which body part cannot develop cancer?
- Why are births so painful? Are animal births painful too? Why we didn't evolve to have easy pregnancies? Maybe it's because this wouldn't really help us survive but I am not sure.
- Why does our body get weaker when we get old?
- What is the relationship between centrifugal force and arbitrary points of reference in space?
- Can you explain me this weird Coriolis effect ?
- Why do baking soda and vinegar clean surfaces?
- Do birds, reptiles, and mammals other than us also use hydrochloric acid to break down food in their stomachs?
- How can a person's risk of death "from any cause" be determined?
- "For reasons even a chemist is hard-pressed to explain, ring shaped gasoline molecules are higher in octane", is this still true ?
- Does the Quadrantid meteor shower get noticeably smaller each year because more and more of it gets burnt up in Earth's atmosphere?
- Is the long half-life of many types of radioactive waste paradoxical to the fact that it is dangerous?
- Why is that something like a potato chip gets soft when "stale" but something like a slice of bread gets hard when stale?
- Is the occurrence of lung cancer declining/going to decline in the US?
- What makes fog more abundant in the morning?
- Why does black light make translucent liquids (like soda and honey) appear opaque?
| Do animals have a sense of humour? Posted: 04 Jan 2019 06:18 AM PST |
| My parents told me phones and tech emit dangerous radiation, is it true? Posted: 04 Jan 2019 04:52 AM PST |
| Posted: 03 Jan 2019 07:56 AM PST It seems that trying to unify gravity and incorporate it in The Standard Model will be impossible since it's not a true force and doesn't need a force carrying particle like a graviton or something. There is no rush to figure out what particle is responsible for water staying in the bucket when I spin it around. What am I missing? Edit: Guys and gals thanks for all the great answers and the interest on this question. I'm glad there are people out there a lot smarter than I am working on this! [link] [comments]  |
| How are movies fipmed in 16:9 transformed into an old TV format without distortion? Posted: 04 Jan 2019 01:31 AM PST Not sure if this is right sub for this q, but if not please tell me where to post. So I guess this now applies to like 10+ years ago when widescreen movies like Star Wars would be played on DVDs in a "standard" format. How does the entire picture still remain without distortion? I remember when I would hit the "widescreen" setting on a standard film, everyone looked stretched out, and vice versa. I get how black bars work because they don't actually change the recorded aspect ratio. I just don't get how to seamlessly change the ratio the other way, basically making the movie 'skinnier' instead of wider than your screen. [link] [comments]  |
| Could a fusion reactor use any element with an atomic number lower than Iron as a source of fuel? Posted: 04 Jan 2019 02:18 AM PST So I was reading about fusion reactions in stars. They can fuse elements up to iron and release energy. Iron and above can be fused but they absorb energy. This got me wondering. We are experimenting with the development of fusion reactors and using different hydrogen isotopes to do this (hope I got this correct). However, once these reactors are up, running and well understood could we use any element with an atomic number below iron as a source of fuel for these reactors? [link] [comments]  |
| Why exactly do litmus change their color? Posted: 04 Jan 2019 04:21 AM PST I just want to know the actual answer and not that it is because litmus is a natural indicator. I know that red litmus reacts with bases to turn blue and blue react with acids to turn red but that's not how we answer things in chemistry, right? What reaction actually takes place when we touch a litmus to an acid? Which reaction is happening? Which chemicals are there which react with acid or base to form whichever color is formed? I am really confused and please excuse my ignorance because I don't know actually a lot about chemistry. [link] [comments]  |
| Which body part cannot develop cancer? Posted: 04 Jan 2019 05:17 AM PST |
| Posted: 03 Jan 2019 02:38 PM PST |
| Why does our body get weaker when we get old? Posted: 03 Jan 2019 04:12 PM PST It probably very stupid, but why does our bodies change so drastically, when we age? Why does our hair become grey? Do we get born with a limited amount of hair dye, and at some day its just all used? We still consume them same things when we get older, so does our body "forgets" to make our hair colourful? Same with our skin. Why does it lose its flexibility? And why do we lose our reproductiveness with age and ultimately die? Evolutionary thinking it does not make any sense, that we get weaker over time and eventually die. As far as I know, our bodies "renew" themselves during a time of around seven years with old cells dying and new ones getting produced, so why are the new cells worse than the old ones? I'm very sure that we don't get some life-spirit-power, when we get born, which we will inevitablely consume during our life until we eventually die. For me it looks like we have a build-in self destruction, which does not make any sense for me. [link] [comments]  |
| What is the relationship between centrifugal force and arbitrary points of reference in space? Posted: 04 Jan 2019 07:31 AM PST This may be a nonsensical question, but the two concepts seem to clash with each other in my mind. Objects in space are often said to only indicate motion by referencing it's relative positioning in comparison with another object. If a single object existed alone in space with no frame of reference, we would say there is no means of determining movement because it is not relative to anything else, is that correct? So given that, what about centrifugal force? If the object is spinning and creating this force from it's movement, would that prove that it was indeed moving without an outside point of reference to compare that movement to? [link] [comments]  |
| Can you explain me this weird Coriolis effect ? Posted: 04 Jan 2019 06:44 AM PST Hello ! Can someone explain me this ? I know it's Coriolis Effect, and it's alright for the small pipe. But for the long pipe which bends, it goes in the wrong direction. Can you explain me why ? Thank you very much scientist friends. [link] [comments]  |
| Why do baking soda and vinegar clean surfaces? Posted: 03 Jan 2019 12:25 PM PST |
| Posted: 03 Jan 2019 06:07 PM PST |
| How can a person's risk of death "from any cause" be determined? Posted: 03 Jan 2019 05:09 PM PST You hear statistics that state something like "getting less than X hours of sleep per night increases one's risk of death by any cause by Y percent." How can one's risk of death "by any cause" be determined? If I sleep less than X hours per night, then by that logic is my risk of being struck by a meteorite or trampled by elephants higher? I know those are both outlandish, extreme, and absurd examples to use, but would they not fall under the category of "any cause?" Or does it just mean organic, health-related causes? "Death by any cause" just seems like a very ambiguous and unspecific choice of words. [link] [comments]  |
| Posted: 03 Jan 2019 04:38 PM PST I'm watching a Modern Marvels episode about gasoline, and they're on the bit explaining about hydrogen fracking, and this line stood out. This episode is probably 20 years old now, does it still hold true ? If so, why ? [link] [comments]  |
| Posted: 03 Jan 2019 05:11 PM PST |
| Posted: 03 Jan 2019 06:31 PM PST I was under the impression that nuclear waste is dangerous because of the decay of nuclei producing high energy particles, but also that the waste takes a very long time to become safe (i.e. it decays very slowly.. with half lives of up to thousands of years). Is there any particular reason both are true? [link] [comments]  |
| Posted: 03 Jan 2019 02:45 PM PST I presume this is a [link] [comments]  |
| Is the occurrence of lung cancer declining/going to decline in the US? Posted: 03 Jan 2019 09:03 AM PST I was watching an older movie recently and as a character was smoking in an office, I had this feeling of WHOA... I remember my parents smoking in the car with the windows rolled up, sitting in the smoking section of a restaurant, etc. By the time I reached adulthood, there were several laws in effect banning smoking from many places. Now of course, there are even more. Many companies are choosing to have a smoke-free facility (even on the grounds). With these new laws in place, second hand smoke should be a huge decrease, right? Aside from circumstances where you are exposed in a job (casino) or casually if you choose (home, bar, etc). Are young people picking up smoking more or less? Is the vaping trend throwing a wrench in the whole deal? [link] [comments]  |
| What makes fog more abundant in the morning? Posted: 03 Jan 2019 12:56 PM PST What does the area need the night before to be really foggy? [link] [comments]  |
| Why does black light make translucent liquids (like soda and honey) appear opaque? Posted: 03 Jan 2019 05:01 PM PST I'm working on a costume, using a black light to charge some glow in the dark paints. As I play with my black light, I swing it on my drink and it looks greenish and opaque under the light. Later, I shine the light on a bottle of honey and it also appears greenish and opaque. However it didn't seem to do that with a bottle of somewhat colored hand soap. I think it has something to do with how black light is reflected and absorbed differently? (Edit: I think this is chemistry related? Physics? I'm not sure.) [link] [comments]  |
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