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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Did DNA, in a quartz container, absorb every photon in the room?

Lance Schuttler wrote an article arguing that DNA is a wave form that uses gravity to bend light. I'm extremely skeptical of basically every claim in the article. One of the more extreme claims ...
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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, ...
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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 ...
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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 ...
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791 views

If the viewable part of lightning goes from the ground up, why does it look like lightning goes from the sky down? [closed]

According to here, it seems like the visible portion of lightning comes from the ground up; however I watched some slow motion YouTube videos, and it is clear that the lightning appears to be ...
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If gas expands then how are stars formed from collapse of gas and dust?

I do have a good understanding of how stars form. Mass exerts gravity and gases will collapse together and when the density crosses a certain limit, the fusion starts in the core. I was reading the ...
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Can light travel at 30x the speed of light? [closed]

The claim seems to be that the researchers can make light travel faster than the speed of light. Is this true? How does it even make sense? It’s in Nature so presumably there’s something in it, but ...
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Is this CCTV video about a chair moving by itself in Essex theatre fake?

from various sources around the internet Daily Mail Is this theatre haunted? CCTV footage captures the spooky moment a chair moves all on its own... hours after a medium's show Get ready to feel ...
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Is there anything inexplicable about how the WTC Twin Towers collapsed? [duplicate]

Possible Duplicate: On 9/11, was Building 7 destroyed in a controlled explosion? Having just watched the movie Zeitgeist, I'm a bit unsettled because I don't know how to refute the idea that the ...
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Can Waterseer extract as much as 37 L per day from the air?

Treehugger.com article on Waterseer Wind-powered device can produce 11 gallons per day of clean drinking water from the air [...] The WaterSeer is relatively simple device, designed to be operated ...
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Will the Sun's magnetic activity disrupt electronics on Earth?

I recently came across a claim that the earth's geomagnetism will change and all the electronics devices will be disrupted due to the Sun's magnetic pole change, as described in this video. ...
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Did Thales conduct experiments in electricity?

Many school texts and other popular sources claim Thales of Miletus conducted experiments in electricity, showing amber to attract feathers, for example, supposedly. However, I can find no verifiable ...
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Does physics give a climate sensitivity to carbon dioxide of about 3°C?

A letter to the editor of the Economist from Professor Anders Levermann of the Potsdam Institute for Climate Impact Research stated the following: The IPCC’s range on sensitivity is supported by, ...
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Have Divine Particles spontaneously appeared in an Indian Ashram?

The Spiritual Research Foundation have some reports of a phenomenon that they have investigated: Ms. Kalyani Gangan, who was there, recollects: “On 5th July 2012 at 7.30 pm, I entered H.H. Dr. ...
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Lawn umbrella as a parachute?

Just saw in a movie, a guy jumped off a building using a lawn umbrella as a parachute. Would that work in reality?
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Does the Theradome Laser Helmet deliver around 7 J/cm2 to the head?

The Theradome Laser Helmet is claimed by its manufacturers to promote healthy hair growth. In this infographic, they claim it delivers energy to the skull at a concentration of 6.959 j/cm2 - ...
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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 ...
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Could a solar flare cause economic collapse? [duplicate]

Possible Duplicate: Will the Sun's magnetic activity disrupt electronics on Earth? It seems that solar flares are one of the few things that have any factual weight among the possible causes of a so-...
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643 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 ...
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Can people run on water?

There have been a few videos around since as far back as 2010 that people can run on water. This is less commonly called Liquid Mountaineering. This is apparently a new sport but I have only ever seen ...
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Time traveling machine invented?

Yesterday a news report said that an Iranian scientist claims to have invented a 'time machine' that will allow one to 'travel' up to 8 years into the future to predict with 98% accuracy the future ...
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Does each doubling of CO2 cause a 2-4°C increase?

Professor Henrik Svensmark argues that cosmic rays have a strong influence on cloud formation and hence climate change. In 2016 he predicted global warming was over. He was recently the lead author of ...
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Is the laser built in Măgurele, România, the most powerful in the world?

Some news websites, including Romanian and non-Romanian ones, claim that the laser built in Măgurele, România (which is going to be used starting today), is the most powerful (and in other sources the ...
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Can a strong solar storm knock out our power grids for months?

It's often said that a strong solar storm can burn out the biggest transformers which would take months to replace. If these transformers are so critical, I can't believe they don't have any safety ...
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Was time travel achieved and then hidden from the public? [closed]

Background Without getting in too much details and going off-topic, I just want to say I personally find that the idea of time travel is ridiculous, at least in the current frame of physics and our ...
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Do lipid droplets in our skin create a laser?

The home page of Dr Jack Kruse, who claims to be a neurosurgeon and "optimal health educator" contains the following paragraph: There is a deep connection between thermodynamics in biology and the ...
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663 views

Do you need specialist filters to look at the sun?

During the UK's recent solar eclipse we were constantly reminded that we should never look directly at the sun because it could damage your eyesight permanently, that you should only look at the ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Evidence for the absolute speed of light

I'm wrapping my mind over Einstein's Special Relativity. He postulates an abolute speed of light which concludes (in my perspective) to several illogical paradoxes. Is there any evidence, that the ...
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Misconceptions about electric theory

Electric misconceptions This is a fairly big question, and is divided into three parts. One part is a separate question. The site lists several common misconceptions, and what the correct way of ...
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Does sealing electrical outlets reduce heating costs?

I stumbled upon this blog post which claims that installing foam gaskets and plugging your electrical outlets with plugs will reduce your heating costs by reducing air leakage. Is this true?
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Was this video of a home made phone charger faked?

A friend of mine recently shared this video on his timeline about turning a cellphone charger into a wireless charger. I am certain that this video is wrong, but I don't know how to eloquently ...
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563 views

Is the water used in coal burning power plants "never returned to the environment"?

According to a Duke University press release titled Replacing Coal with Gas or Renewables Saves Billions of Gallons of Water: Water consumption – the amount of water used by a power plant and ...
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Does Heads Up Texas Hold'em have more possible hands than atoms in the universe?

In the Vice (HBO) clip AI Poker Bots Are Beating The World's Best Players, it is claimed (at 2:00), that Texas Hold'em has "more possible hands than atoms in the universe". ..this competition ...
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Do tea cosies keep a pot of tea warm?

Wikipedia claims, without attribution, that a tea cosy: ... insulates a teapot, keeping the contents warm The purveyor's of these teapot covers follow a similar vein: Pretty, original and practical,...
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Does grabbing a fidget spinner in zero G cause your body to tumble rapidly?

Techly have posted a video they attribute to NASA. It shows ISS astronauts looking at a fidget spinner floating in space and grabbing it. After a jump-cut, they are shown tumbling (rotating along all ...
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Kim Il-Sung's birthday present: a solar eclipse?

I heard this story, where they celebrated the birthday of the now defunct North Korean dictator Kim Il-sung in the 1970s and as a birthday present they created through some very complex artillery ...
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1answer
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How powerful are air cannons?

I wondered how powerful air blasters are. Is it possible for one to be so powerful that the shock wave passes through walls, floors and ceilings? Could it make bumps on metallic surfaces or at least ...
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1answer
643 views

Electro-osmotic pump to keep bunker dry

Supposedly the latest tech in keeping water out of (historically significant) bunkers is electro-osmotic pulse technology. EOP is based on the principle of electro-osmosis—the movement of a liquid ...
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1answer
340 views

Does the Wowfixit screen protector harden phone screens?

The WOWFIXIT web-page offers a product where you wipe a liquid over your phone screen and polish it. They claim the result will make your protect your phone screen from scratches: One of the many ...
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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 ...
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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 &...
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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 ...
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555 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 ...
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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 ...