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.

9
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1answer
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 ...
6
votes
1answer
5k 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 ...
30
votes
0answers
617 views

Does cutting paper dull a knife quickly?

This question is a follow-up to "How to test the sharpness of a knife?", my answer to it, and the comments my answer generated. Charlie Brumbaugh wanted to know how to tell when he is done when ...
18
votes
0answers
9k views

Does sleeping together naked help stay warm?

In a bunch of films and other entertainment, when characters find themselves in a cold place with no heating but must sleep, they conclude that to stay warm, they should sleep as close to each other ...
16
votes
0answers
3k views

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 ...
14
votes
0answers
333 views

Is Feynman's claim about the history of measurements of the charge of the electron after Millikan accurate?

In a 1974 speech Richard Feynman famously described an example of confirmation bias in science: One example: Millikan measured the charge on an electron by an experiment with falling oil drops, and ...
13
votes
0answers
1k 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 ...
10
votes
0answers
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 ...
7
votes
0answers
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 ...
6
votes
0answers
3k 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, ...
6
votes
0answers
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 ...
5
votes
0answers
387 views

Does the Eco-Cooler reduce temperatures in tin huts by around 5° Celsius, compared to simple windows?

The zero-electricity Eco-Cooler made from plastic bottles is doing the rounds all over the interwebs: Over 70% of Bangladesh’s population live in corrugated tin huts across the countryside. During ...
5
votes
0answers
634 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 loads. ...
4
votes
0answers
449 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 ...
4
votes
0answers
233 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 ...
4
votes
0answers
243 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 ...
4
votes
0answers
185 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 ...
3
votes
0answers
195 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 ...
3
votes
0answers
1k 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 ...
2
votes
0answers
458 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 ...
2
votes
0answers
446 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 ...
2
votes
0answers
506 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 ...
2
votes
0answers
280 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, ...
1
vote
0answers
233 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 ...