Why are the "I'm not a robot" captcha checkboxes separate from the actual action button? Why can't the button itself do the human detection? |
- Why are the "I'm not a robot" captcha checkboxes separate from the actual action button? Why can't the button itself do the human detection?
- To what extent, if any, is finished concrete such as that found in most urban structures reuseable and recyclable?
- How does carbon dating accurately work considering all of the molecules likely come from beyond ancient supernova?
- How deep do Ocean currents go? Do they affect the water at the bottom of areas like the Mariana Trench?
- What would be the result if we somehow trap photons in closed metallic sphere that is as reflective as a mirror on the inside?
- Are there different mitochondrial "Eves" found in the DNA of ancient humans?
- Why does rain come down as drops and not all at once?
- Shouldn't all multicellular organisms develop some sort of cancer given enough time?
- What makes the electronic configurations of transition metals so unique?
- why do all atomic masses have decimals if there are some elements that only have one isotope?
- How does the drug 5-fluoroorotic acid select against URA3 in haploid S. cerevisiae?
- How did the discovery of DNA affect the field of taxonomy? Were dozens of species 'wiped out' by discovery of identical genetic profiles?
- Does quantum entanglement allow us to study some of the paradoxes associated with time travel?
- is there a reason our map is the direction it is?
- What causes light to slow when it travels through a medium?
- Is is theoretically possible for us on earth to create all the elements Synthetically?
- Is space the same as distance?
- Is there such a thing as an "anti" catalyst?
- So stars ever flat out collide during the rotation of a galaxy?
- Why is there no desert zone between the temperate and tropical zones on the Asian east coast?
- Are humans capable of Unihemispheric Slow-wave Sleep?
- Can any bacteria survive the boiling point of water?
| Posted: 05 Apr 2016 07:55 AM PDT |
| Posted: 06 Apr 2016 05:38 AM PDT Just wondering about limestones as a finite resource for the concrete industry. What are the constraints on the efficiency of the hypothetical recycling of concrete? If it is technically possible, what would be the economic constraints on doing so? [link] [comments]  |
| Posted: 06 Apr 2016 06:55 AM PDT |
| Posted: 05 Apr 2016 07:38 AM PDT I was wondering if the water that sits at the bottom of some of the deepest trenches ever circulates with the rest of the water above it. Or is the water that's down there now, the same water that's been down there for thousands of years? [link] [comments]  |
| Posted: 05 Apr 2016 09:40 PM PDT Would that would produce heat from all the back and forth reflection? EDIT: I am assuming 100% reflectivity. [link] [comments]  |
| Are there different mitochondrial "Eves" found in the DNA of ancient humans? Posted: 05 Apr 2016 09:41 PM PDT I'm aware of analyses of mitochondrial DNA that give us a general age for the female ancestor of all current humans, but have similar analyses been done on more ancient human remains (the more ancient the better) that indicate a different mitochondrial "Eve" for these ancient populations? [link] [comments]  |
| Why does rain come down as drops and not all at once? Posted: 05 Apr 2016 07:42 AM PDT |
| Shouldn't all multicellular organisms develop some sort of cancer given enough time? Posted: 05 Apr 2016 10:11 PM PDT |
| What makes the electronic configurations of transition metals so unique? Posted: 05 Apr 2016 06:30 PM PDT Current undergrad here taking a level 1000 course. (By unique I meant that I'm unable to grasp what's going on microscopically.. :( ) According to the one electron system approximation/model, the 4s atomic orbitals have a lower energy levels, translating into stability for the system and thus getting filled first. This leads to (n)s subshells being filled first, before moving into (n-1)d subshells. Traditionally, this would be that the electrons in the d subshells are of higher energy levels, and thus would be favorably removed when ionization occurs, yet this is not the case for transition metals e.g:
This question then extends to Nickel, which has electronic configuration:
Is there an explanation for what is occurring here? I have done some reading which shows plots of energy levels of 4s and 3d subshells, indicating a crossover at around Z=21 (which is Sc), from thereupon which the 3d orbital has lower energy than the 4s orbital with an increasing energy gap. What is the significance of the gap here? I have slight exposure to Schrodinger's equations and energy level calculations, but is there an explanation besides the math which would help my understanding? Thanks in advance! [link] [comments]  |
| why do all atomic masses have decimals if there are some elements that only have one isotope? Posted: 05 Apr 2016 06:34 PM PDT Atomic masses are the weighted average of all the isotopes of the element; hence, the atomic mass is always in decimal form as a fractional average. But if some elements only have one isotope ( as is known (e.g. see digipac.ca/chemical/molemass/isotope1.htm), why would the atomic mass be in decimal form? [link] [comments]  |
| How does the drug 5-fluoroorotic acid select against URA3 in haploid S. cerevisiae? Posted: 05 Apr 2016 08:44 PM PDT From my understanding, diploid yeast strains, specifically in Candida albicans, select against URA3 through homologous recombination. How does this selection work in a haploid strain? I've only been told that it "works" and I'm curious as to the mechanism of the selection. [link] [comments]  |
| Posted: 05 Apr 2016 07:42 AM PDT Also, was there resistance from the taxonomy community due to the prestige was attached to naming new species? Are there species still considered 'distinct' despite functionally being identical genetically? [link] [comments]  |
| Does quantum entanglement allow us to study some of the paradoxes associated with time travel? Posted: 05 Apr 2016 06:03 PM PDT I recently came across this fascinating video of the Delayed Choice Quantum Eraser Experiment where a single photon passes through a double-slitted barrier and is subsequently split by a prism into two entangled photons. The first photon always goes to the same detector, D0. The second photon goes on a different path to meet a number of possible detectors. D0 doesn't give any way to determine which slit the original photon went through. However, the other detectors may or may not give that information, depending on their position. Since the two particles are entangled, D0 will show either an interference pattern or a clumped pattern based on which detector the second photon hits. These results are always 100% correlated. Based on the detector the second photon hits, you will always know the pattern at D0. Also, based on the pattern at D0, you will know which of the possible detectors the second particle must have hit. If the path to D0 is shorter than the paths to the other detectors, doesn't that mean we can predict the future with 100% certainty? If we make the paths of the other detectors extremely long, couldn't this give us time to attempt to change the results that we see at D0? In my mind this is analogous to the grandfather paradox - where the future is known, but somehow we are prevented from changing it. This experiment seems awfully simple to set up. And it would appear to be simple to change the results after seeing D0. Has this been done before or is there something I don't understand? Thanks!!!! [link] [comments]  |
| is there a reason our map is the direction it is? Posted: 05 Apr 2016 06:24 PM PDT i saw a pic of a map of florida that was upside down to help tourists or something. i started to wonder if there is any reason that north america is on the top of the map and south america is below it. is there a scientific reason or did they just have to pick a direction? [link] [comments]  |
| What causes light to slow when it travels through a medium? Posted: 05 Apr 2016 08:23 AM PDT |
| Is is theoretically possible for us on earth to create all the elements Synthetically? Posted: 05 Apr 2016 07:09 PM PDT I know we have created a bunch of man-made elements. It also seems we can synthetically make a couple of natural ones. How about all the rest? [link] [comments]  |
| Is space the same as distance? Posted: 05 Apr 2016 05:20 PM PDT And wouldn't distortions of space likewise distort everything within it to the same degree? [link] [comments]  |
| Is there such a thing as an "anti" catalyst? Posted: 05 Apr 2016 04:30 PM PDT Basically, is there something that can raise the amount of energy needed for a reaction? [link] [comments]  |
| So stars ever flat out collide during the rotation of a galaxy? Posted: 05 Apr 2016 01:17 PM PDT Like are we likely to collide with another star or is the gaps that big? [link] [comments]  |
| Why is there no desert zone between the temperate and tropical zones on the Asian east coast? Posted: 05 Apr 2016 12:40 PM PDT |
| Are humans capable of Unihemispheric Slow-wave Sleep? Posted: 05 Apr 2016 07:20 AM PDT https://en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep USWS has been observed in marine mammals. Evolution might favor human USWS sleepers because of the ability to 'keep watch' overnight from predators and hostile forces. Has USWS been observed in sleep deprived people such as soldiers stationed in hostile contexts for extended periods? Has USWS been observed in humans in the lab? Is it possible for a human to train themselves to enter USWS on demand? I've seen some hints that one hemisphere of the brain may need more sleep than the other. Does USWS always happen on the same side of the brain or can it happen on alternate hemispheres? If a person is completely blind in one eye, do the hemispheres still share the same Circadian Rhythm (no light stimulation of one hemisphere)? If so, do these people experience USWS more commonly? [link] [comments]  |
| Can any bacteria survive the boiling point of water? Posted: 05 Apr 2016 09:28 PM PDT |
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