DARK SECRETS: Explaining how unknown things work - The Real Truth

SiriusGD:
Flush holes for drainage and raised holes for traction. Without flush holes more water would accumulate. Without raised holes you'd slip.

It's a  Galileo thermometer. It is a thermometer containing a clear liquid and several glass vessels of varying density. The individual floats rise or fall in relation to their respective density and the density of the surrounding liquid as the temperature changes.

Ninfyr:
When a grid's misaligned
with another behind
That's a moiré.
When the spacing is tight
And the difference is slight
That's a moiré.

Wi1dWitch:
Light and dark tell brain where light source from, therefore what is indented vs. …outdented?
Because the middle row is flipped, your brain goes whoops! Light source is the other way! Then sees the third row and goes whoops! Again. Because your eyes are constantly moving between the rows, your brain keeps flipping them.
To “turn off” this illusion, cover 2 of the rows and the remaining row will suddenly look normal and stable.

DrachenDad:
Rack and pinion, ratchet clutch, flywheel, return spring. When you squeeze the trigger (rack) it spins the pinion attached to the flywheel. When you release the trigger the rack disengages and the flywheel maintains momentum.
Dis_Bich:
I think the other guy explained it well. But I’ll translate it to English. The fans are attached to a piece of plastic with lots of gears. The force of the spin makes the blades go out in the fan way. So when you squeeze the trigger, you’re making lots of gears move all fast at the same time and then you get spinny wind

Notice how the plate is at ground level? This is a merry go round specifically made to be wheelchair accessible without having to be removed from the chair. Kids in wheelchairs are able to roll onto it, lock their wheels, and then use the steering wheel to spin themselves. It spins slowly because some kids in wheelchairs could have small spinal injuries and fast whipping motions can injure that further. The slow start and stop help these kids have fun while also being as safe as possible!

EspenJoris:
Coat hangers up top, and fold your pants over the bottom ones.

1Steelghost1:
Open the hood, look underneath. There are support beams. They hold onto the engine heat longer than the rest of the thinner hood.

xulazi:
It's treated with an antimicrobial agent that slowly releases as vapor over time to inhibit spores. It's meant for small spaces and will probably lose efficacy fairly quickly in the grand scheme of things. If you want to protect your clothes I would get damprid for that.

igottaknife:
When the ice cube starts to freeze, it creates a tiny hole. Water expands when it freezes. So, as it continues to freeze, the expansion continues, and the water is forced upward. This action continues until It’s completely frozen ending up in a spike like you have there.

SmokyMcPots420:
The construction-duty equivalent of jacking up a car. Im not 100% sure of the process but after hurricane Sandy my house was lifted 12 feet and sat on wooden blocks like that for over a year.
Fresno_Bob_:
In crawlspace houses, the floor is made of horizontal beams (joists) that sit on top of a foundation wall and are supported in the middle by posts to keep the joists from sagging. It's mostly empty space under the house.
To do what you see in the picture, moving companies open holes in the foundation wall and run steel beams under the house perpendicular to the joists. Then they use heavy duty jacks to raise the house off the foundation wall and posts. A second set of steel beams goes perpendicular to the first and the whole thing is bolted or clamped together to form a rigid platform for the house to sit on.
Here they've stacked cinder blocks under the beams while the house waits to be moved. Cinder blocks are plenty strong to support a house, as they're a common material for foundation walls.

NoRealAccountToday
My Dad had a similar one. The coil is simply a flash boiler. The idea is that you pump some pressure into the tank that holds the bug juice. When you open the valve, it flows under pressure into that (red hot) coil. At that point it boils violently and escapes as a dense fog out that nozzle. The one my Dad had put out some serious fog...better than any disco smoke machine

Peacockmantis_shrimp:
The pixel block that is showing the E has come loose and fallen down at an angle. It’s not a font nor is there extra pixels.

mayovegan:
It's just density. The denser particles sink, leaving the clear liquid at the top. This is not a sign of your juice going bad, actually it's a sign that it is fresh and without additives to prevent this like in shelf stable juice!

UMCPEnt:
The little rubber nubbin at the tip is electrically conductive, so it simply conducts the resistance / capacitance of your squishy bits through the pen into the screen.

MagicOrpheus310:
Oil with food colouring, it's heavier than the water and since they won't mix, gravity will pull the oil to the bottom

willem_79:
When a toilet bowl is made, it’s cast into a plaster mould using a liquid clay that forms and hardens onto the mould as the water gets sucked into the plaster (slipcasting). The inside is complicated because you need the lip so the form wouldn’t just pull out so this is made in a few sections that can be pulled out in sections: what i think has happened here is that the plaster form has a fault which has caused either a weird suction rate that’s deformed the shape, or it’s been damaged and the clay has formed to the defect. Either way it doesn’t look deliberate, but more like a flaw. In some countries, the defective pieces are sold at a heavy discount depending on how bad they are aesthetically, to at least make some money vs scrapping it.

Next-East6189:
Minerals, light conditions, micro organisms
madladdie:
Little plant or algae growth in or on the water, the sediment has settled to the bottom, and white rocks/sand/clay reflecting up light.

anonymous:
so im assuming this is an ice lake and that temperatures here are very low
so the way water freezes is the outside first then the inside and also water expands as it freezes - so when the water began to freeze on the outside and expand it pressured the water on the inside so much that it burst out - and now the water is in a 'less dense' position it can freeze almost instantly
this is very rare !

ABunnywithlongEars:
It works by flipping each switch at the top with the corresponding room. Then you turn on the 8 switch then pull down on the top left switch to talk. You also need to turn on one of the dials not sure which one.

When you blow air into it, it inflates the tube and pushes it out of its rolled-up position to fully extend and inflate.
In my experience, the one in your picture doesn’t make a noise, just a “thwump” as it extends.
Other ones that are open on both ends will make a noise from air passing over a hole.

The "plastic piece" beside the wick is actually a clear optical fiber designed to detect the light of the flame and activate the internal color-changing LEDs. 

it will probably have elastic straps or velcro that hold the clubs

It's a clothes iron. it's for everyday clothing care. The voltage settings are likely because it is a travel iron so if you are across the pond for business or whatever you can change voltage to whatever voltage standard that country uses.

It is for holding the hose. You loop the hose around the slanted part.

Audiene:
the center part looks like it's supposed to be a bottle opener.
LengthinessBroad644:
You can also use the finger crusher to slide down cilantro/ parsley stems and get just the leaves

The FDA only requires food labels to list ingredients if they meet a certain threshold. My guess is 1 serving is “sub threshold” for sugar and 2 services is “beyond the threshold.”

It is a tool to align the teeth of a saw.

Roll the knife the same number of times on each side and don't press too hard.

it held gas and water lines in old churches and structures long ago

If you're not blind, you don't need to care about these. The traffic light is automatically switching to green at some point. Those things are for blind or sight-impaired people. On the bottom, there's a button which can be pressed. If pressed, during the next green phase, there will either by a noise or vibration signal or both to give the impaired person a non-visual signal.
There are traffic lights where you have to request a green phase, but they will be different. They are explicitly marked with »Bitte berühren« meaning »Please touch« and the top section is red and will light up once the touch has been registered. Usually, those will also feature the button on the bottom for visually impaired for the described used above.

ties, scarves, airdrying shoes

VelveteenDream:
I have this toy. You fill their little water bottle, and it starts an invisible timer that triggers the babies to drop from the ceiling.

nileo2005:
They probably just glued the stained glass onto the front of the microwave's existing window.
VStarlingBooks:
Since it's an interactive art exhibit, the microwave emitter is more than likely removed or at least disabled.

thedaNkavenger:
Possible Ehlers-Danlos Syndrome
budgie02:
Please don’t do this, it seems like a fun party trick but if it is EDs, or hypermobility this can actually damage your joints and make issues a lot worse.

thedaNkavenger:
Those aren't just apples. It's apple processed with sugar so there's probably not as much apple as you'd expect from actual dried apple. The serving size is 1/20th of the bag. If you were to eat the whole bag you might get some fiber but the individual serving size amount is negligible.
Basically you're eating candy with real apple in it.

JoseSpiknSpan:
So, basically, how this works is by blocking an enzyme, which in turn reduces the production of chemicals in your body that cause inflammation. It doesn't specifically affect your back. It just goes everywhere, and since your back pain is due to inflammation in your back, it helps with that. It is part of the class of medications called NSAIDs. These include Tylenol, Ibuprofen, and Aspirin.

temporary62489:
The two black gaskets hold the fuel in. The bearings allow it to spin. The snap rings hold everything together.

FreddyFerdiland:
the palm and finger skin is different to normal ( as in back of hand ) skin
this highlights the line that divides the two types
the palm,finger , and sole of foot have the extra thick epithelium layer.

nileo2005:
It does restrict the flow, just not enough to completely shut it off. Anything varying from a straight pipe will restrict flow, and even then a straight pipe will still have pressure losses and flow restriction to a minor amount.

Condensation line from HVAC would be my guess.

it looks like a hole to put your thumb while using the slicer to allow you a good hold on the bowl/topper.

You can hang the entire suitcase up by either the handle, or another hidden hook. You then open the suitcase and use the hook on the left to keep it from sagging. It allows you to have clothes hung up without having to unpack them completely, or leave the suitcase laying out all the time.

Because there’s space between the lens of your phone camera and the cover lens (I think) so you get a reflection of what you’re looking at cast on the lens taking the photo.
I mostly see this happen with phone pictures that I’ve taken of a few beautiful sunsets of my own. It’s the sort of think Michael Bay loves, but his were bigger because film cameras a larger, but there’s also a good chance it was added in post for funsies

I think you have to cut it in half and spoon out the middle. I don't think it's worth it, though. It takes like watery cucumber

Heated air inside the lid expands and creates a pressure gradient with the air outside the lid. As interior cools, the expanded air collapses causing lower pressure inside the lid vs outside the lid. The higher pressure air on the outside then presses the lid against the pot creating a pressurized seal. Moisture on the lip of the lid likely sucks and tightens the seal against the pot even more.
*Source: Educated guess

coffeegrunds:
But a lot of the times they don't realize for a long time, until someone points out that the blue crayon they're holding isn't blue, or that the brown blanket is actually red. There are little image tests online everywhere, just look up color blind test.

Many dance shoes have this closure for quick changes. The strap is designed to slide into the hook with the buckle holding it in place.

can't be stolen or used as a weapon