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Posts by TextKit‭

15 posts
20%
+0 −6
Q&A How do I calculate which concentration of Vinegar is cheapest, before diluting it? [closed]

Presuppose that I need vinegar of $c$ concentration, where $c$ < any concentration listed below. Let $w$ be the price of water that I'll use to dilute. How do I deduce which concentration (of V...

1 answer  ·  posted 7mo ago by TextKit‭  ·  closed 7mo ago by Mithrandir24601‭

Question fluid
42%
+1 −2
Q&A To what extent does blender speed dissolve table salt + cold tap water?

At home daily, I need to mix my table salt + COLD tap water. As "Marine salts dissolve faster and more thoroughly when added to circulating water," I "use a powerhead to speed up mixing time — my V...

2 answers  ·  posted 1y ago by TextKit‭  ·  last activity 9mo ago by matthewsnyder‭

Question hydro
25%
+0 −4
Q&A Why can these Single Vision lenses slow myopia for kids, but not adults? [closed]

These WorldFamous companies advertise that their lenses can control myopia for kids, NOT adults. But none of these lenses are approved by FDA. I asked my optometrist why merely kids, not adults. Bu...

1 answer  ·  posted 1y ago by TextKit‭  ·  closed 1y ago by Mithical‭

Question optics
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Q&A Optically, why are circular eyeglasses lenses better than rectangular?

My optometrist said that round eyeglass lenses are OPTICALLY better than rectangular, particularly to correct myopia. He was NOT referring to fashion or style. I couldn't understand his explanatio...

1 answer  ·  posted 2y ago by TextKit‭  ·  edited 1y ago by TextKit‭

Question optics
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Q&A Why can someone observe light, even when the light fails to illume that someone?

I never grokked the optics behind LightHouses and the WW2 poster below work. LightHouse beams are narrow and focussed. Doubtless, the light source can fail to illumine a seafarer or the enemy subm...

1 answer  ·  posted 2y ago by TextKit‭  ·  last activity 2y ago by Olin Lathrop‭

Question light
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Q&A Why do markers reflect light, even when the light source fails to illumine the space between the source and markers?

Please see below screenshot of 15:59.The LED spot light (fastened to the front of the boat) illumines merely a few meters in front, and fails to illumine most of the water between the boat and the...

1 answer  ·  posted 2y ago by TextKit‭  ·  last activity 2y ago by Olin Lathrop‭

Question light
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Q&A Are lamps, with blistering light bulbs exposed and facing down on the user, dangersome?

IKEA discontinued this NOVEMBER lamp in 2007, but I still use it. IKEA confirmed that they did not intend or design any cover or share with this lamp, and the light bulb is supposed to be exposed. ...

2 answers  ·  posted 2y ago by TextKit‭  ·  last activity 2y ago by celtschk‭

Question light
30%
+2 −7
Q&A Why did my roller luggage's wheels stop turning smoothly?

Two weeks ago, my carry on worked perfectly. But last week the detachable wheels stopped rotating smoothly, when I tried to glide my carry on. The wheels budge JUST A TAD when you push them hard, b...

0 answers  ·  posted 2y ago by TextKit‭  ·  last activity 2y ago by deleted user

Question motion friction
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Q&A Is it rational to freeze water bottles during colder nights, and place them in front of a fan during warmer days?

Is this advice correct? Are they alluding to Freezing Point Depression? Adding salt to tap water lowers the Crystalloid's freezing point. Pour 3 tbsp (51 g) of salt into each of your 3 plast...

1 answer  ·  posted 3y ago by TextKit‭  ·  last activity 3y ago by manassehkatz‭

42%
+1 −2
Q&A Does folding glasses increase the probability of separating at the hinge?

Please see the images below. I owned these Mykita John glasses for three years, which feels short for glasses to break! Every day, I fold them them before placing it on my night stand and going to ...

1 answer  ·  posted 3y ago by TextKit‭  ·  last activity 3y ago by Olin Lathrop‭

Question lenses
30%
+1 −5
Q&A How dangerous is mounting and firing a gun on another human's body part? [closed]

I stumbled these pictures on Quora, and I'm assuming they were real. Wouldn't the supporter (person whom gun is mounted on) suffer hearing loss? Wouldn't the barrel burn his ear? I'm assu...

1 answer  ·  posted 3y ago by TextKit‭  ·  closed 2y ago by Mithical‭

25%
+0 −4
Q&A For cleaning food and objects, power scrubber vs. Electric rotary toothbrush? [closed]

I'm not asking about cleaning human organs here. This handheld power scrubber looks like your average rotary toothbrush! Indubitably I know that a toothbrush's brush head can be far gentler than...

0 answers  ·  posted 3y ago by TextKit‭  ·  closed 3y ago by Mithrandir24601‭

Question pressure
57%
+2 −1
Q&A Why would a 1.74 index lens be more prone to chip and be less resilient than 1.67?

My optician counselled me I don't recommend a 1.74 index with a metal grooved frame, like the one you want from ic! Berlin, because the edge will be less resilient and be more susceptible to chi...

1 answer  ·  posted 3y ago by TextKit‭  ·  last activity 3y ago by Olin Lathrop‭

Question lenses
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Q&A Explain like I'm 5 – After glancing at a clock, why does the first second sometimes feel longer than the rest? [closed]

I don't understand either of these Reddit comments that are still too complicated. Please simplify? Alfenhose An interesting phenomena, it is because the brain doesn't store what you saw during ...

0 answers  ·  posted 3y ago by TextKit‭  ·  closed 3y ago by Mithrandir24601‭

Question time
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Q&A How can I turn a floor lamp, that lights upward, into a reading light? [closed]

How can I turn this floor lamp into a reading light? I want all light exiting upwards from the lamp shade to point down. Do I just buy a mirror and put it on top of the lamp shade? Then the mirror...

0 answers  ·  posted 3y ago by TextKit‭  ·  edited 2y ago by TextKit‭

Question light