Questions tagged [physics]

Use this tag for questions about the physical nature of reality and in particular claims that are strictly about the field of physics. Please use specific tags if the question is about other sciences such as chemistry. Also consider to add [electromagnetism] and [radiation] if appropriate.

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Breaking the bottom brick with your hands

In the movie Bloodsport, which claims to be based on a true story, the lead character is challenged to break one brick at the bottom of a stack, using only his hands. He successfully causes the bottom ...
Brian M. Hunt's user avatar
14 votes
0 answers
2k views

Is Columbia's Omni-Heat Reflective technology effective?

In this advertising video published by Columbia Sportswear, Omni-Heat Reflective is introduced as a technology which reduces body heat loss by reflecting body heat radiation (back to itself) using ...
Ali Shakiba's user avatar
10 votes
0 answers
2k views

Does putting a dorodango in the fridge aid evaporation, or just compress the dirt?

Background Dorodango is the art of making shiny mud spheres, such as these: To make a dorodango, you collect a core of dirt (optionally mixing in color powder), mold it into a sphere, and then rub ...
Steve V.'s user avatar
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9 votes
1 answer
9k views

Do "liquid solar blankets" work to stop heat from escaping a swimming pool?

There are products on ther market that claim to spread a thin layer of proprietary transparent liquid over the surface of your pool to reduce evaporation and thus retain heat. One product is ...
rjt's user avatar
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8 votes
0 answers
1k views

Can some people beat roulette wheels using "visual ballistics"?

In the past, people beat roulette wheels using machines that measure ball speed and predict where the ball will land. That is discussed in the question Is it possible to gain an edge in roulette ...
Riemann's user avatar
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7 votes
0 answers
542 views

Does an avocado ripen faster in a paper bag?

I've always heard that an avocado could ripen faster if put in a paper bag. These claims can be found in many places on the internet : The best way to ripen avocados How to ripen an avocado Here is ...
Einenlum's user avatar
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7 votes
0 answers
5k views

Are flat cables tangle-free?

Well, probably everybody knows and hates this. Detangling the headset cable when putting it out of your pocket. This headset product claims to prevent the cable from tangling up by the "flat cable ...
Hauser's user avatar
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6 votes
0 answers
4k views

Graphene "heat sink" sticker for your mobile phone battery

This product (Japanese language) is claimed to cool down your smartphone, etc, battery by two degrees centigrade - see the photo a little way down the page. It claims to be a graphene-based material, ...
Ken Y-N's user avatar
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6 votes
0 answers
2k views

Risks of using a cast iron skillet on a flat/glass top electric range?

There are many claims about possible risks of cooking with a cast iron skillet on a flat/glass top electric range: the glass top can break if one is not careful; the glass can be scratched; the glass ...
ESultanik's user avatar
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6 votes
1 answer
6k views

Does putting our head to the ground remove "positive electromagnetic charges"?

A few Muslim friends claimed that putting your head to the ground like what you would do during Muslim prayers helps you by discharging your head from positive electromagnetic charges. I personally ...
Moe's user avatar
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5 votes
0 answers
521 views

Do antistatic car-straps reduce static shocks from cars?

There is a line of anti-static rubber straps sold for cars which attach to the chassis of the car and dangle down to the road. It is claimed that they allow static electricity to drain off, preventing ...
Oddthinking's user avatar
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5 votes
0 answers
652 views

Do "reusable chemical-free dryer sheets" reduce static cling?

Inspired by another recent question about dryer sheets: According to the retailers of purecosheet, these reusable dryer sheets can make your fabrics "soft and static free" for hundreds of ...
Oddthinking's user avatar
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4 votes
0 answers
474 views

Does this video show a sonic boom through a sun dog?

This YouTube video purports to be of a rocket launch from the Kennedy Space Center in 2010. It shows a rocket reaching the speed of sound, and creating a sonic boom at the same time as the rocket ...
Ernis's user avatar
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4 votes
0 answers
2k views

Is biochemical transmutations of elements possible?

According to a recent press conference Russian scientists have made a breakthrough so astounding it could change the universe as we know it in fundamental ways. The essence of this discovery and ...
Andy  Gee's user avatar
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4 votes
0 answers
245 views

Can StoreDot batteries be charged in two minutes?

CNET writes: StoreDot's system, which you can see in action in the video [at the link], uses a different chemical makeup to traditional batteries. We saw a modified Samsung Galaxy S5 go from 15 ...
phact's user avatar
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4 votes
0 answers
2k views

Did Thomas Edison kill elephant Topsy?

It is largely believed that Edison electrocuted lot of animals to prove that AC current was dangerous. There is a video on youtube that goes to show that Edison killed Topsy. But in Wikipedia I found ...
minusSeven's user avatar
4 votes
0 answers
255 views

Is a weaver's knot more secure with both ends on the same side?

There are two different ways one can make a weaver's knot. One has both ends on the same side (a) the other on opposite sides (b). Pictures and a statement "the two free ends should end up on the ...
Jonas Stein's user avatar
4 votes
0 answers
192 views

Is decanting wine in a blender the same as in a decanter?

Is it true that putting wine in a blender for a few seconds (or using something like the Vinturi wine aerator) gives me the same result as putting the wine in a decanter for 1 or 2 hours as suggested ...
bitbonk's user avatar
  • 421
3 votes
0 answers
479 views

Does Reversing Ceiling Fan Direction Improve Energy Efficiency?

There is an often cited statistic in the HVAC field that reversing the ceiling fan direction can save 10% on heating bills due to air circulation. I would imagine that this is somewhat true due to the ...
Sarah Szabo's user avatar
3 votes
0 answers
376 views

It is feasible to produce energy at 2ct/KWh using alpha-, beta- and gammavoltaics?

At Tuesdays COP26 session called Economics of Climate Change a company called Infinite Power proposed a carbon neutral way to provide baseload for electricity grid. Their technology claims work by a &...
worldsmithhelper's user avatar
3 votes
0 answers
900 views

Do sparks from a cigarette lighter fix dead zones on touch screen?

There are many forums posts and videos on the "lighter trick" which fixes touch screens dead zones (at least temporarily) such as The YouTube video Nokia Lumia Touchscreen Dead Zone Fix With ...
Symmetry's user avatar
  • 147
3 votes
0 answers
687 views

Can electricity be obtained from neutrino radiation, like a solar cell?

Power Technology magazine published a 2019 article *Neutrino energy: harnessing the power of cosmic radiation. It describes a new energy technology - making solar panels, but for neutrinos instead of ...
David Elm's user avatar
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3 votes
0 answers
423 views

Is there any scientific basis to this "catalytic converter" to treat hard water?

I came across this product called Softer Water Conditioners. It includes a lot of scientific sounding mumbo-jumbo to explain how it works, which raises my skepticism. Is there any scientific basis to ...
Masked Man's user avatar
3 votes
0 answers
677 views

Was a working prototype of the Warburtons toastie knife ever produced?

The Life Hack Stack Exchange has an answer talking about a prototype "toastie knife" from Warbutons Bakery. It was claimed that the prototype knife would heat up to allow butter to be spread more ...
candied_orange's user avatar
2 votes
0 answers
663 views

Can ridges on the bottom of shakers be used to help with dispensing?

From https://twitter.com/LipBitinANNAmal/status/1078840770864529408 156,700 Retweets 376,681 Likes (probably not the original author): How old were y’all when you found out the ridges on the bottom ...
Golden Cuy's user avatar
2 votes
0 answers
819 views

Does carrying or consuming onions help to prevent heatstroke and/or reduce your body temperature?

Will consuming onions help to reduce your body temperature, or prevent heatstroke? Some common variations of this claim include applying onion juice to your skin, or even just carrying an onion in ...
RToyo's user avatar
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2 votes
0 answers
303 views

Can Magic Leap deliver its claims about their future augmented reality product?

Magic Leap has been very outward with their public face regarding their upcoming augmented reality product. They've been promising a great deal, and the media has hyped up their image as a result, ...
TND's user avatar
  • 129
1 vote
0 answers
2k views

Does rotating a soda can on a table prevent it from fizzing over when opened?

In this scene from Season 6 Episode 7 of Better Call Saul, the character Howard Hamlin shows that one can stop a shaken soda can from exploding when opened by first rotating it vertically while it is ...
tryst with freedom's user avatar
1 vote
0 answers
362 views

Do photons have friction?

In the book 1998 biography, A Beautiful Mind, by Sylvia Nasar, John Nash is said to have entered Einstein's office to discuss his ideas that photons have friction. Nash had an idea about "gravity, ...
Nico Damascus's user avatar
1 vote
0 answers
253 views

Can a plastic tent keep contaminants out and emulate a safe clean room?

I was reading an article on why opening the cover of a hard drive was a bad idea. In the article, the author mentions that the safest way to open the cover of a hard drive was to do it in a class 100 ...
ILikeTacos's user avatar
-1 votes
1 answer
356 views

Can using black glue coating on an umbrella block 99.99% of UV-A and UV-B radiations?

I read on https://smile.amazon.com/gp/product/B07XP321LY/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 (mirror): Black glue umbrella is the newer version sun umbrella instead of silver glue ...
Franck Dernoncourt's user avatar