After reading and understanding the reasons , I am interested to find out why the dust particles stick so well. Spraying powerful jets of water does not effectively remove the dirt. Some scrubbing is still required, whether it is metallic blades or plastic ones.  Why is that so?
97670
Why does dust stick to rotating fan propeller?  Intuitively, most people (including I) think of the dust will not stick to rotating fan propellers.
44375
Hello. I am a beginner in Blender. I started modeling this phone and when I got to the curly cable part it was a real challenge. Could someone guide me on this.
46994
What are recommended settings for my Nikon Coolpix P1 to best portray rain?  Here's what I got. No retouching was applied.   The picture I took when the rain was heavy with the automatic settings:  The picture I took with the "Sports" program; by then, however, the rain was not as hard. Ugh, ugly gray strip at the bottom, that was the flat surface I put my camera on to get a stable picture.   My main problem is that the actual rain and hailstorm is very hard to see in the picture. The overall effect is, instead, of fog.    Follow-up from the thread, courtesy of more rain, now with less hailstorm and more thunder.  The feedback amounted to flash and faster shutter. I took a few photos and I'm having some trouble to reconstruct what I did to get each result. Two representative results:   Fast shutter, with some guest starring:I'm talking about that horrible building obviously. Faster shutter and flash:Kinda difficult to say those pictures were taken sixty seconds of each other. :)   I'm not sure, however, that either of this is really an improvement of the original results.
21355
I am working on a project that requires the water to shoot out of the end of the pipe rather than what it is doing right. Now, I have played with some of the settings but am kinda afraid to mess with it too much since I am new to blender, and it does not play well when I mindlessly click.   Would I generate more fluid particles? Or would I change some property about the inflow animation? I added a cylinder object to the top of the pipe as well, I think that will help keep all the water inside of the pipe.   Thank you once again and have a great day!
28337
It's an old argue on forums, still cant get it. What is the (real, that worth the money and time for ordering from abroad, in my case) difference, let's say between  shoes and some kind of old school skate shoes (the fat ones, like )?  P.S as far as I know most dirt BMXers are quite happy with regular skate shoes.
71309
To get rid of dust that had gathered near the fan, I put a vacuum cleaner to the air intake (with the computer turned off).  This removed the dust.  It also caused the fan to rotate at a fairly high speed. Quite faster than normal speed, judging from the sound.  Do I risk destroying stuff by doing this?
84399
I know I'd probably use a combination of Noise Textures, but I have no idea how I could make it look realistic with varying combinations of random dots, scratch- and hair particles etc. I could only find some explanations on how to achieve standard film grain, nothing too detailed.
24129
I think everyone should have seen a bowl of hot water moving by itself on a flat surface such as glass(seems like it is moving by itself but maybe there are some external force applied to it when it moves). What is the explanation of this phenomenon?  Hypotheses :   Since the bowl is heavy, for it to move the friction between the bowl and the surface must be very very low. I have heard that water may form a thin layer between the bowl and the surface, but l'm not sure whether it is the case or not. I think the bowl can move by itself because heat makes the air below the bowl expand.   Edit : I will re-experiment those again and update the question in few days. Maybe I will take a video clip too. and I am not talking about a magic trick whatsoever.
123100
School in South Korea removed asbestos over the past few weeks. Now I am all paranoid.   Is this asbestos? Found these dime-sized chunks by my desk.          Higher resolution images are available here:    There should be 4 pics. If not clear enough let me know.
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Do I still need to use washers for a motherboard? I've just recently gotten my hands on an MSI 770-G45, and I noticed the spots on the board where the screws are supposed to go have no metal around them, like the other boards I've worked with, see . The case I've gotten came with MB screws, but do I still need to get the washers?
13512
What exactly are the spikes, or peaks and valleys, caused by in pictures such as these    Wikipedia states that "From the point of view of magnetic energy, peaks and valleys are energetically favorable", but I'm not exactly sure what that means, or how it works. Why isn't the fluid just happy being attracted to the magnet in a semi-sphere shape? Could it be that it gains a magnetic charge, so it attempts to repel itself at the same time? Just pulling at straws here.
82087
What are the ways electrostatic charged objects leak charge in humid conditions?  Can airborne particles pick up charge by contact, then be repelled hence removing charge? If so would it be a significant factor?
19395
as we know, there are some perturbations on a falling jet which are always present and according to their wave number and the radius of the jet, they can grow and decay over time. so, imagine a jet which has those sort of long wavelength waves traveling downward on it, we put an obstacle on the path of the jet and then we would see this :    so, what exactly happens to those waves by the presence of an obstacle?   why have those waves been too larger in amplitude and too short in wavelength in presence of an obstacle?  This photo has taked by sayyedali.m.(  Qom)in Shahid qodosi high school
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(Sorry: above links in Slovak.)   Can someone explain this to me? Is it a hoax?  (In case of link rot try  or  Youtube search.)
20915
At xmas, I had a cup of tea with some debris at the bottom from the leaves.  With less than an inch of tea left, I'd shake the cup to get a little vortex going, then stop shaking and watch it spin.  At first, the particles were dispersed fairly evenly throughout the liquid, but as time went on (and the vortex slowed, although I don't know if it's relevant) the particles would collect in the middle, until, by the time the liquid appeared to almost no longer be turning, all the little bits were collected in this nice neat pile in the center.  What's the physical explanation of the accumulation of particles in the middle?  My guess is that it's something to do with a larger radius costing the particles more work through friction...
30308
When I searched on the Internet for the reason of formation of , I got many explanations like  one &amp; . All the explanations consider only one spherical water droplet (like ).  Why don't the refracted waves coming from the adjacent droplets interfere with each other? For example, why doesn't a red ray coincide with a violet ray coming from another droplet at a suitable position?   How are we able to see rainbows with distinct colors? Since there are thousands of raindrops in the sky when it is raining, shouldn't it be a mess due to overlapping of different wavelengths?  Please explain.
89609
I just  that the wasp nest pictured is a .     This is the second such nest I have on two edges of the same outside wall on adjacent years. I'm either inattentive, or they are particularly fast: the nest is built before I notice. One idea that worked with the first one was to spray shaving foam over it. Luckily the foam stayed there long enough, and the entrance was no longer menacing. The second one, pictured, seems to have served its function and is now empty.  The wikipedia page linked above suggests they might reuse a previous nest, and so I'll pull this off soon to avoid a recurrence.  Apparently they find something particularly attractive at this location. The color of the bricks? That the spot is shielded from rain? Is there a way to dissuade them from building in this particular spot?  I have also had yet another wasp nest below a layer of leaves in a bag near this entrance. Is this the same species? Might the presence of leaves act as an incentive to build the "organ pipe" mud dauber?