What determines the lifespan of a species? Why do humans have such a long lifespan compared to say a housecat? |
- What determines the lifespan of a species? Why do humans have such a long lifespan compared to say a housecat?
- With the advancement of led lights and other more power efficient appliances in homes is the average home power usage going down?
- When we are told the speed of an astronomical body, what is used as a reference point for that speed?
- How much does shivering affect core body temperature when cold?
- How did scientists in the 1800's know that they isolated an element and that it wasn't a novel chemical compound?
- Why can't human cells use anaerobic processes to create ATP when in an atmosphere of no oxygen?
- Do wild animals suffer from chronic diseases like cancer, diabetes or Alzheimer’s?
- Why is caffeine, a polar molecule, soluble in supercritical carbon dioxide?
- Where are logic gates used?
- Why is it so common for groups of animals to become unable to breed after being seperated for a few hundred thousand or million years? What kind of changes make breeding impossible across species?
- Why can't helium freeze?
- What is the most efficient propeller design?
- Is melanin for skin color inherently linked to melanin for hair/eye color?
- What's the best the best way to transmit data Voyager deep into space with today's technology?
- What is the purpose of LPS-stimulated cytokine release?
- Why do wind turbines spin in only one direction?
- How do rockets start in vacuum?
- Why do things become squeaky and increase in friction when they're clean?
- What are the environmental and wildlife concerns for fields of solar panels in Nevada?
- Do linguistic relativism/determinism theories (Sapir-Whorf Hypothesis) explain that stigmatizing words compound societal stigma?
- What about autosomal trisomies makes them so often fatal?
- Do cut off christmas trees still convert carbon dioxide to oxygen?
| Posted: 18 Dec 2017 06:18 PM PST |
| Posted: 18 Dec 2017 01:58 PM PST I also understand that we have more electronic devices now but are they overall less power hungry? [link] [comments]  |
| Posted: 18 Dec 2017 07:34 PM PST I was just reading an article on the astroid shooting through our solar system called Oumuamua and it mentioned that it was traveling at 95,000 mph. 95,000 mph in reference to what? [link] [comments]  |
| How much does shivering affect core body temperature when cold? Posted: 18 Dec 2017 10:01 AM PST |
| Posted: 18 Dec 2017 10:54 AM PST I feel like it'd be very difficult to first isolate an element, then to know that you have gotten to the element, rather than a new compound. It doesn't seem like there's any test you can do determine that without a lot of supporting evidence or advanced equipment. Were people mistaking compounds for elements as they made discoveries? [link] [comments]  |
| Why can't human cells use anaerobic processes to create ATP when in an atmosphere of no oxygen? Posted: 18 Dec 2017 07:18 PM PST I know that some single-celled organisms are capable using fermentation to catabolize glucose and other sugars to create ATP in the absence of oxygen, so what prevents humans from being able to do the same? We have the enzymes necessary and use anaerobic fermentation at times of high exertion, so why can't we use fermentation at times of low exertion to keep the body alive when in the complete absence of oxygen? My best guess is that the body isn't able to use fermentation to create ATP at a rate that matches the body's energy needs, but I'm hoping it's a little more interesting than that. [link] [comments]  |
| Do wild animals suffer from chronic diseases like cancer, diabetes or Alzheimer’s? Posted: 18 Dec 2017 07:37 PM PST |
| Why is caffeine, a polar molecule, soluble in supercritical carbon dioxide? Posted: 18 Dec 2017 05:38 PM PST I am under the impression that caffeine wouldn't be very soluble in super critical carbon dioxide due to the difference in polarity, yet it a ver popular method for extracting caffeine from coffee beans. Is this something special about supercritical fluids? [link] [comments]  |
| Posted: 19 Dec 2017 06:01 AM PST |
| Posted: 18 Dec 2017 08:25 AM PST |
| Posted: 19 Dec 2017 04:53 AM PST Why do some things ( like CO2) skip states of mater and things like helium can't get cold enough to become solid? [link] [comments]  |
| What is the most efficient propeller design? Posted: 19 Dec 2017 04:14 AM PST [engineering] Or what is the most efficient way we know of to propel using air? [link] [comments]  |
| Is melanin for skin color inherently linked to melanin for hair/eye color? Posted: 18 Dec 2017 05:49 PM PST Basically: does more melanin in one of these traits automatically mean more melanin in the others? For example, if you had two mixed-race parents who can have kids with either light or dark traits, would it be possible for them to have a kid with very dark skin but very light hair/eyes (hair/skin color genes are discrete)? Or would the large amount of melanin production in the child's skin also add up to darker hair/eyes automatically (hair/skin color are controlled by the same genes)? [link] [comments]  |
| What's the best the best way to transmit data Voyager deep into space with today's technology? Posted: 18 Dec 2017 07:01 PM PST What's the best the best way to transmit data Voyager deep into space with today's technology? Why don't we have satellites on foreign planets? I'm watching a Voyager documentary and am feeling inspired. [link] [comments]  |
| What is the purpose of LPS-stimulated cytokine release? Posted: 18 Dec 2017 05:52 PM PST I'm curious as to what specific research questions are satisfied with LPS-stimulated cytokine release through use of whole blood, as opposed to running high sensitivity ELISA kits on blood plasma. [link] [comments]  |
| Why do wind turbines spin in only one direction? Posted: 18 Dec 2017 12:09 PM PST |
| How do rockets start in vacuum? Posted: 18 Dec 2017 02:00 PM PST So i know that rockets bring their own LOX to oxidize the fuel. But how do they start the reaction without the vacuum of space pulling the chemicals out? So I imagine that they pump in fuel and LOX and ignite it with an electrical spark or similar, but then because there is vacuum outside the nozzle, why don't the combustion get snuffed out? [link] [comments]  |
| Why do things become squeaky and increase in friction when they're clean? Posted: 18 Dec 2017 01:22 PM PST |
| What are the environmental and wildlife concerns for fields of solar panels in Nevada? Posted: 18 Dec 2017 02:00 PM PST |
| Posted: 18 Dec 2017 07:20 PM PST For example, if consistent use of stigmatizing terms, such as addict/alcoholic (or similar in non-English languages) , occurs in a given society, does stigma both get reinforced but also, over time, result in explicit modification of the way individuals view those labeled with such terms? Short version: does constant use of stigmatizing words compound the effect over time and result in individuals actually internalizing stigmatizing the generalizations assorted with these terms? If so, does the modification of terms used from stigmatizing to more positive alternatives result in cognitive changes? Over what length of time would something like this occur? [link] [comments]  |
| What about autosomal trisomies makes them so often fatal? Posted: 18 Dec 2017 06:36 AM PST I understand that extra sex chromosomes are easily avoided because of X inactivation, but why are autosomal trisomies (with the exception of less severe ones, such as trisomy 21 and 18) so fatal in humans? What in the human body causes most autosomal trisomies to be fatal? [link] [comments]  |
| Do cut off christmas trees still convert carbon dioxide to oxygen? Posted: 18 Dec 2017 06:37 AM PST So i was walking past a christmast tree sales stand, noticed the fresh forest-smell and was wondering if these cut off trees still freshened the air arround them. [link] [comments]  |
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