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86 votes
Accepted

Do nails and hair continue to grow after death?

No, this is false. The University of Arkansas Medical Services debunks this myth: Hair and fingernails may appear longer after death, but not because they are still growing. Instead, a persons ...
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  • 18k
58 votes
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Is a married woman in Michigan required to have her husband's permission to cut her hair?

The claim is false. For at least 171 years (93%) of Michigan's 184 year existence, married women in Michigan have NOT needed their husband's permission to do anything to their hair. Since 1850, the ...
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13 votes
Accepted

Is it possible to get a reliable match from 'microscopic hair analysis'?

In this NYT video it is said that a 2002 paper found that the false positive rate is 11% when also tested via mtDNA. The paper referenced is probably "Correlation of microscopic and mitochondrial ...
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  • 49.3k
12 votes

Is a married woman in Michigan required to have her husband's permission to cut her hair?

There is a video of a Michigan attorney debunking that claim. While he points out correctly that it is comparatively hard to prove a negative, he has tried to do just that. See the first of the points ...
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10 votes
Accepted

Does stress cause hair to go grey?

Evidence: A 2013 study found that hormones produced in response to stress can reduce melanocyte stem cells that determine hair color. A 2013 New York University study published in Nature Magazine ...
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  • 22.4k
10 votes

Does onion juice increase hair growth?

There are a great many quirky cures spread all over the internet and most of them have no evidence besides a series of bloggers boasting their benefits. In this case however, it seems we might have a ...
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  • 486
8 votes
Accepted

Can an electric chair shock raise your hair?

The Death Penalty Information Centre describes the process (which is no longer used in the United States): For execution by the electric chair, the person is usually shaved and strapped to a chair ...
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  • 132k
7 votes

Does washing your hair with a coal-tar soap prevent hair loss and accommodate hair growth?

In its essence this is true. Therapeutic doses of coal tar – or Liquor carbonis detergens – are used and effective against overproducing sebum, dandruff and a range of other problems with hair. Its ...
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  • 42.9k
6 votes

Does laser phototherapy treat male pattern hair-loss?

I was totally ready to say this is a complete and utter sham, however I have found two papers that seem to indicate that there is some positive effect from using the Hairmax device. A Rutgers team (...
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  • 9,196
6 votes
Accepted

Is removing hairs from a mole harmful?

As per my comment, this was actually asked in the NY Times Science section. Q. If I tweeze out the single hair that grows from a facial mole, will it cause cancer, as my friend insists? A. “No,” said ...
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  • 9,196
6 votes

Does trimming your hair regularly make it grow faster?

The hair doesn't know, that it's been cut. Means that the hair grows as long as the anagen period allows. It grows continuously before it eventually stops, no matter how often you cut it. The ...
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  • 71
5 votes
Accepted

Does garlic improve hair growth in androgenetic alopecia?

No. There is no evidence to support that garlic has an effect on androgenetic alopecia. The first paper you cite, shows that garlic is effective in synergism with betamethasone valerate in alopecia ...
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  • 2,856
5 votes
Accepted

Do hats or ponytails induce baldness?

tl;dr- Yes, wearing hair such that it's pulled tight can cause hair loss. Wearing loose-fitting hair styles or head wear shouldn't cause as much hair loss; whether or not it causes none at all or ...
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  • 4,040
4 votes

Is a married woman in Michigan required to have her husband's permission to cut her hair?

This claim has changed over time. It may have originated as a Wisconsin story. I found some key details in the March 29, 1954 edition of the The Holland Evening Sentinel: There is a famous case of a ...
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  • 38.4k
4 votes

Do you need to "wash, rinse and repeat"?

"Repeated wash and rinse is required for most people?" – No – no need! Earliest usage or origin? Rumour has it that David Ogilvy invented this "trick" for Proctor & Gamble". But it is unlikely ...
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  • 42.9k
4 votes

Do North Korean men have to cut their hair like Kim Jong Un does?

The haircut itself is called the 'Dear leader haircut' and is one of a small number of styles men can choose from. wantchinatimes.com Male university students in North Korea are now required to get ...
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  • 1,477
3 votes

Does the Theradome Laser Helmet deliver around 7 J/cm2 to the head?

A 510(k) premarket notification must be submitted by device manufacturers to the US Food and Drugs Administration (FDA) to show a device is just as safe and effective as an existing device (referred ...
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3 votes
Accepted

Does hair fall first from the top of head because of reduced blood supply due to lack of movement?

Hair falls from the top of head first because the follicles there are more androgen-sensitive. Within the distribution of hair over the scalp, androgen-sensitive hair follicles are on top and ...
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  • 96.4k
3 votes
Accepted

Does gelatin aid hair and nail growth?

I did a quick google search on this one and the first result I got back was this link which explains the history of knox gelatin and when it started being used as a supplement to allegedly increase ...
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2 votes

Can reducing DHT by dietary means reduce or reverse hair loss?

There are many types of hair loss (alopecia) with different symptoms and causes and alopecia may lead to permanent hair loss. "Numerous factors may be related to hair loss and range from naturally ...
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  • 22.4k
2 votes

Does gelatin aid hair and nail growth?

I know about hair, not fingernails. But what Ian Gallant writes about nails is true of hair, too. Any diet with enough protein to keep you in good health doesn't need supplementation with protein. It'...
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2 votes

Does Finasteride reduce hair loss?

Separate studies are conducted on men and woman. Long-term treatment with finasteride 1 mg decreases the likelihood of developing further visible hair loss in men with androgenetic alopecia (male ...
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  • 96.4k
1 vote

Does your hair grow faster when you're sick?

This is not a very authoritative answer but skimming through this book on The Biology of Hair Growth leads me to doubt it. It talks a lot about the limited factors which can stimulate hair growth but ...
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  • 7,049
1 vote

Are red-heads going extinct?

Some phenotypes caused by recessive genes occur in sub-populations that tend to reproduce with other members of the sub-population. For example, Tay-Sachs disease is a recessive genetic disease ...
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  • 38.4k
1 vote

Do dogs tend to distrust men with beards?

Dogs have some kind of facial recognition according to studies, for example http://link.springer.com/article/10.1007/s10071-013-0713-0 Abstract Faces play an important role in communication ...
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  • 59

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