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5
votes
1answer
978 views

Does putting a reflective screen inside your car against the windshield have a meaningful impact on internal temperature?

In southern climes one can see many such reflective screens on cars in parking lots. Not all drivers use them, but many do. Is there a meaningful impact on the internal temperature of your car? Does ...
2
votes
1answer
295 views

Does sun screen cause cancer?

I been recently informed by my little sister who is in high risk for skin cancer and uses sun screen frequently that certain sun screens contain chemicals which are known carcinogens. I wonder if this ...
8
votes
1answer
5k views

Does Vitamin D created by sun exposure get washed off in the shower?

A recent article by Dr Mercola on a health advocacy web site makes a number of claims about Vitamin D production in your skin. The most surprising to me is the claim that you can wash off a ...
3
votes
0answers
3k views

Must one reapply physical sunscreen every two hours?

I have read from several sources online* that any suncreen, even physical sunscreen, must be reapplied at least every 2 hours (or more frequently if you've been swimming or sweating). For chemical ...
12
votes
3answers
2k views

Are cheap sunglasses bad for your eyes?

Conventional wisdom and tips in magazines often state that you shouldn't buy cheap sunglasses because they don't protect well against UV rays. There are two claims in one here, I am skeptical about: ...
9
votes
1answer
2k views

Is it possible to get a sunburn if you're behind a (glass) window?

Someone recently told me that windows act as a kind of "magnifying glass". That doesn't make a lot of sense to me. Here's an example of someone with that belief (in the comments): Can a baby get ...
8
votes
1answer
356 views

Is there a health risk from nanoparticles in sunscreens?

There have been various stories in the news in the past couple of weeks in Australia about peoples perception of nanoparticles in sunscreen. To quote from the linked story above: This week, the ...
12
votes
1answer
894 views

Does “eye black” improve vision under glare conditions?

Some sports people wear "eye black" (black strips on the upper cheek) under glare conditions (sun or stadium lights) to reduce glare. For example, one brand claims it is: used on the field to ...
10
votes
0answers
16k views

Is vinegar a sunburn remedy?

While searching for a remedy for sunburn pain last year, I ran across multiple references to vinegar as an effective method in treating sunburn pain. Is there any research that validates or ...
24
votes
2answers
2k views

Are sunscreens necessary?

There are many warnings of skin cancer due to exposure to sun, which have turned sunscreen lotions/creams/sprays into a big industry. Apart from the problem in the product, my question is, are ...
9
votes
1answer
888 views

Is looking into a solar eclipse especially dangerous?

I mean looking at a partial or annular eclipse, or before or after totality, and specifically the claim that it is more dangerous than looking into the sun. I've heard two versions of this: It is ...
8
votes
1answer
2k views

Does hair grow faster in the sun?

I've been told that hair grows faster when you are in the sun, is there any truth to that or is it a myth among people in a sun starved country? :) Related: Does plucking impact hair ...
9
votes
1answer
27k views

Do solar eclipses cause harm to pregnant women?

There are so many articles in the internet that say going out during a solar eclipse causes harm to pregnant women. Is this claim true? Why did this myth come in the first place? This is from a BBC ...
10
votes
1answer
1k views

Is sun protection clothing a real alternative to sunscreen?

I was reluctantly dragged along to do clothes shopping in Singapore today and all over the place they advertised clothing that has supposedly been coated with some form of UV protection. As far as I'm ...
35
votes
2answers
14k views

Does staring at the sun cause significant, permanent harm?

Of course, I think I can safely assume if an eye is left pointing directly towards sun for a long period of time it does get major damage. However, staring at the sun also hurts very quickly. That ...