89 votes
Accepted

Does milk make your bones stronger?

A summary of recent evidence suggests: In children with initial low calcium intake, an increase in milk/dairy intake is associated with an increase in bone density. In adults, milk/dairy consumption ...
Jan's user avatar
  • 4,994
66 votes
Accepted

Did The Lancet publish an account of a woman who did not age?

It seems that we don't know, but probably not. What we have here is a notable person claiming without a reference that a peer reviewed journal supposedly reported on what many might consider a miracle....
Jordy's user avatar
  • 3,846
63 votes
Accepted

Did the study mentioned by "The virginity fraud" TEDx Talk happen?

See Genital Anatomy in Pregnant Adolescents: “Normal” Does Not Mean “Nothing Happened” Pediatrics, January 2004, volume 113, pages e67-e69. METHODS The purpose of this study was to summarize the ...
DavePhD's user avatar
  • 105k
61 votes

Can venomous snakes be determined by these pupil, nostril and scale patterns?

No, this is not true. Not even for just India, as Indian cobra (Naja naja) has round pupils and subcaudal (tail) scales are divided. There is also no pit visible. It is venomous species of snake. ...
Reconquistador's user avatar
58 votes
Accepted

Are blue light filters, not blue lights, on phones and computer screens harmful to sleep?

This is the study itself if you want to read it. Yes it is a study in mice. It is evidence but not proof that blue filters are counter-productive, at least according to the authors of this single, ...
Brian Z's user avatar
  • 7,352
56 votes
Accepted

Does vegetarian sweat smell better?

"Smell" is a sense that is said to be more directly tied to emotional processing in the brain than other senses. But all interpretations of sensory information is subject to subjectivity. And smell is ...
LangLаngС's user avatar
56 votes
Accepted

Do people carry around up to 20 lbs (9 kg) of poop?

No. According to the chapter "Carbohydrate Metabolism in the Colon" in Human Colonic Bacteria (1995) : The large intestine contains about 220 g wet weight of contents (range circa 60–900 g),...
DavePhD's user avatar
  • 105k
41 votes

Can the Bajau people stay underwater for as long as 13 minutes?

I will say 'no'. According to the study Underwater working times in two groups of traditional apnea divers in Asia: The Ama and the Bajau, Bajau divers dive for 28 seconds with an standard deviation ...
thelawnet's user avatar
  • 5,231
36 votes

Do people carry around up to 20 lbs (9 kg) of poop?

Those Ads were popular on TV years ago. They all claim some permanent build-up of "extra poop" which only a cleanse can remove. I found a lovely 2018 quote from a skeptic medical office of ...
Owen Reynolds's user avatar
33 votes

Is there a point of no return when starving to death?

tl;dr: Yes, there is a point at which recovery is not possible without significant medical intervention. Death by starvation is not simply a matter of running out of energy to sustain life, so cannot ...
Dave Sherohman's user avatar
29 votes

If one man is shot in the head while holding a gun to another man, can the former get a shot off on the latter?

Yes, it is possible for one to get a shot off after being shot in the head oneself. Here are two different examples, both involving cab drivers being shot in the head and still returning fire. For the ...
DavePhD's user avatar
  • 105k
27 votes

Are women physically weaker?

Grip Strength When testing grip strength, a median young adult man is stronger than about 98%+ of young adult women. Even the top fraction of female athletes as a population are only slightly ...
Murphy's user avatar
  • 9,466
26 votes

Can venomous snakes be determined by these pupil, nostril and scale patterns?

... maybe a bit more education hurts even less... but the answer is still no. So to me the description with pits and slit pupils (and also the head drawing) looks like indicating pit vipers. I don't ...
cbeleites unhappy with SX's user avatar
25 votes
Accepted

Is the comeback of measles in the US "largely due to anti-vaxers?"

The answer depends a lot on what mechanism you imply and who you consider to be "anti-vaxxers". If you consider anti-vaxxers to be all groups of people who as a group oppose vaccination (e.g. for ...
redleo85's user avatar
  • 1,960
25 votes
Accepted

Does it take two weeks for a single man to produce enough sperm to impregnate every fertile woman on Earth?

Theoretically that is rough-ballpark-correct. But that is assuming that you would need only one sperm per woman, which is unrealistic. Using the... erm... "normal" way, not every sperm finds its way ...
DevSolar's user avatar
  • 19k
24 votes
Accepted

Does defecating while sitting cause more strain than squatting?

Normal defecation is initiated by three components (1) spontaneous phasic contractions of rectum starting during filling. (2) smooth muscle relaxation of the anal canal with an increased recto-anal ...
pericles316's user avatar
  • 22.7k
23 votes
Accepted

Is any unconscious person capable of full splits?

No. The claim, that "when unconscious, we are all capable of full splits", is not supported by evidence. There is not a great deal of literature on this topic. One paper on a similar topic “...
BKE's user avatar
  • 1,520
22 votes

Can black people, on average, jump higher than white people?

According to Relationship between vertical jump and maximal power output of legs and arms: Effects of ethnicity and sport Scandinavian Journal of Medicine & Science in Sports Volume 25, April 2015,...
DavePhD's user avatar
  • 105k
22 votes

Can venomous snakes be determined by these pupil, nostril and scale patterns?

That is a diagram for identifying pit vipers. There are many, many venomous snakes in the world, including I believe all of the most deadly ones, that are not pit vipers. The advice is particularly ...
T.E.D.'s user avatar
  • 1,588
17 votes
Accepted

Has a human baby's heart started beating only 18 days after conception?

The fetal heart may begin to beat at approximately the 22nd day after fertilization which corresponds to 3 weeks and 1 day after fertilization i.e. 5 weeks 1 day of pregnancy. Between 5 ½ to 6 ½ ...
pericles316's user avatar
  • 22.7k
17 votes

Is 1,7% of the population born intersex?

The 1.7% figure is from this article[1] (emphasis mine): Adding the estimates of all known causes of nondimorphic sexual development suggests that approximately 1.7% ...
Mindwin Remember Monica's user avatar
16 votes
Accepted

Does it take time for the brain to realize that you have eaten too much?

The mechanisms of hunger and satiation are regulated by the endocrine system, not through the much faster nervous system. The specific hormone that regulates appetite is ghrelin. When the stomach is ...
PoloHoleSet's user avatar
  • 9,688
16 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 ...
Brian Z's user avatar
  • 7,352
15 votes

Does synthetic vitamin C contribute to the formation of genotoxins that can lead to cancer?

In a sciencemag.org article, which was apparently about this study, they state that: In the process of destroying free radicals, vitamin C turns into what's called a vitamin C radical. If certain ...
Honest Abe's user avatar
14 votes

Are physically attractive people more likely to be right wing politically?

When I encounter popular reporting on scientific claims, I have a checklist that I go through to check its credibility. I do not try to evaluate their methods myself, because I cannot rigourously ...
BobTheAverage's user avatar
13 votes

Were humans placed on Earth by aliens?

Ellis Silver takes a number of features of human physiology, claims they are inexplicable by evolution, and comes to the extreme conclusion that aliens placed humans on Earth. However, each of the ...
Oddthinking's user avatar
  • 141k
13 votes

Does it take two weeks for a single man to produce enough sperm to impregnate every fertile woman on Earth?

Based on some information in the answer by DevSolar I will estimate the number of sperm in the range of 190-290 million a day, which as noted has a fair amount of uncertainty. However, I'm willing to ...
fyrepenguin's user avatar
12 votes
Accepted

Does UA Rush bodywear improve athletic performance?

I started with search engines looking for supporting evidence. However, I found none, so I decided to contact Under Armour directly. (Ping me in chat and add a comment for the full transcript. I have ...
Barry Harrison's user avatar
12 votes

Does the heart pump blood through arteries?

Your reasoning is faulty. You assume that the capillaries are a single tube of length 60,000 miles. In fact they are many tubes running in parallel, so the flow of blood is divided between parallel ...
Paul Johnson's user avatar
  • 15.8k
12 votes
Accepted

Does watching pornography increase sexual performance in women?

The relevant research paper doesn't address the question as to whether or not pornography increases sexual performance in women. Sommet and Berent (2022) found a correlation: In contrast, among ...
Rebecca J. Stones's user avatar

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