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20 votes
Accepted

Can light travel at 30x the speed of light?

An analogy: suppose there's a long line of swings. You run along the line, pushing each swing as you go. This will result in each swing being slightly out of phase with the one before it. There will ...
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17 votes

Can a lightbulb once inserted into your mouth be safely removed?

While it's a bad idea to put fragile glass objects in your mouth, the primary assertion here is clearly false. First of all, there are at least five different YouTube videos where people try it out ...
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  • 7,049
12 votes
Accepted

Does switching the lights off help avoiding mosquitoes?

Q Does switching the lights off help avoiding mosquitoes? In short: "yes", but with so much caveats that ultimately the needed qualifier is "but it's not effective". The caveats are: not all ...
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11 votes
Accepted

Are people physically sensitive to light from LEDs over other sources?

Yes, it is recognised as a potential problem: LED lighting flicker and potential health concerns: IEEE standard PAR1789 update. The IEEE Standards Working Group, IEEE PAR1789 “Recommending practices ...
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  • 1,092
10 votes

Are blue lights giving people cancer?

The thinking is that disrupted sleep results in lower melatonin production which through some unknown mechanism might make the body more vulnerable to the cancers. This is classical clickbait. Even ...
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  • 201
2 votes

Should I refrain from putting my clothes to dry outside on a full moon?

There are two parts to this book's statement: 1) That nights with a full moon are colder [than those without] 2) That cold temperature increases hydrogen peroxide formation in dew. For the first part,...
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2 votes

Do blue lights on railway platforms reduce suicide?

The claim that installation of blue streetlights in Japan caused a reduction in suicide rates is unproven by research since experts say there’s no conclusive evidence that blue lights will prevent ...
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  • 22.5k
2 votes

Can blue light from LCD panels cause damage to the eyes?

There is no evidence that sitting at a computer screen has any effect on the development of age-related macular degeneration or any other retinal problems except for eye straining referring to Dr. ...
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  • 22.5k
2 votes

Are blue lights giving people cancer?

As far as I'm aware, there is a intermediate factor which could explain it: the circadian rhythm In the field of chronobiology, it has already been determined that light plays a major role in ...
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1 vote

Are car headlights getting brighter?

Obviously, my source is looking at headlights. However if one has internet access you can look it up. Wikipedia seemed to have the most info in one spot but additional info at other sites would be ...
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1 vote

Are blue lights giving people cancer?

From the University of Exeter link: A study led by the Barcelona Institute for Global Health (ISGlobal) and involving the University of Exeter found that participants living in large cities ...
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