Hot answers tagged

60

Yes. You are referring to a classic experiment in Perceptual Adaptation from 1896: George M. Stratton, Some Preliminary Experiments On Vision Without Inversion of the Retinal Image (Read at the Third International Congress for Psychology, Munich, August, 1896.) Here's a video from a BBC documentary reproducing the experiment. You can also check this book ...


50

Yes, we are taller in the morning. From The transformation of spinal curvature into spinal deformity (2005): The effects of gravity on the upright human posture are powerful: Individuals are as much as 25 mm taller in the morning than in the evening (1)(2), as a result of compressive forces bearing down all day, And astronauts 'grow' by nearly ...


39

The T.Rex is more closely related to birds than to Stegosaurus. The comic shows it in 3 different aspects: Time: From the T.Rex Wiki page, it lived during: Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 67 to 65.5 million years ago. While the Stegosaurus lived: They lived during the ...


38

TLDR : Yes. A person wearing glasses that inverted the vision would in a few days adapt and perceive the vision as normal. see Perceptual Adaptation George M. Stratton, a psychologist, was intrigued by the idea of perceptual adaptation. Because the retina receives images upside down, he was intrigued to see what happens when the brain receives an ...


37

Short answer: No Here is a study from the Journal of Investigative Dermatology: The effect of repeated shaving on human hair growth was studied. Five healthy young white men each shaved one leg weekly for several months and left the other leg as a control. No significant differences in total weight of hair produced in a measured area, or in width or rate ...


32

Data Estimated number of eukaryotic (human) cells in the human body: 1.0×1014 —Wolfram Alpha The haploid human genome (23 chromosomes) is estimated to be about 3.2 billion base pairs long. —Human Genome – Wikipedia The full DNA content of a cell is therefore 6.4 Gbp. Average base pair size: one bp corresponds to approximately 3....


14

No: Photograph from Memo Ochoa no tiene pensado regresar His first link had a photo too. Maybe this is photoshoped Other images of him show the usual number of fingers. Also The Province reported: Mexican goalkeeper Guillermo Ochoa does NOT have six fingers on his right hand. It's possible that they're all photo-shopped; it's even possible that ...


12

TL;DR version: Of the potential risk factors listed, pregnacy is the only one for which there is some systematic evidence linking it to this type of "sneeze pee" incontinence, called stress incontinence in medical terms. The other putative risk factors, "too much sex" or STDs aren't backed by evidence (or even discussed) in the reviews of stress incontinence ...


12

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 “Neurophysiologic influences on hamstring flexibility: a pilot study” concluded: Averaged over all 11 subjects, no change in the flexibility of the hamstring was ...


11

Asians have vaginas that are the same as people of European descent. Inspired by Oddthinking's suggestion of using Chinese Sex Ed or biology textbooks, I decided to use something slightly more convenient: Wikipedia. The Japanese and Chinese editions of Wikipedia use the same diagrams for vaginas as those for European languages. They don't use a parallel ...


10

Based upon Bilateral Asymmetry in Weight and in Length of Human Bones The Anatomical Record vol. 152, pages 217-224, the right, not the left is bigger. On average the right ulna is 2.419 mm longer than the left. The right radius is 2.590 mm longer than the left. The person to person variance of the above difference is such that the standard deviation ...


10

Is this image "lying", not showing both types of connections for both genders? The article claims scientific accuracy and to report a scientific paper: does this image represent its conclusions in a fair manner? Well, it's certainly reporting some of the conclusions correctly. But it's not telling the whole truth. The article doesn't seem to give the exact ...


9

It's very hard to say what is the cause of the bunny's situation, however, it's a somewhat common phenomenon, which is caused mainly by mutilation and not genetic defects. An NBC news article from 2011 cites University of Miami biologist Dana Krempels, and rabbit expert on the issue: There are many different reasons a rabbit may be born this way or ...


7

This paper studies single mouse heart cells. It is behind a paywall, but the abstract clearly states: Summary Single beating cells may be prepared from the young rat heart. These cells may beat for up to 40 days. So, we can easily conclude that, yes, it is in fact possible to do so. There is also video evidence of a single heart cell ...


7

Fortunately, the study in question, Coffee intake and CYP1A2*1F genotype predict breast volume in young women: implications for breast cancer, is available online. The basic answer is that the study provides no indication of an influence of coffee consumption on breast size. The best summary I found in the paper reads: Our main finding was a significant ...


7

The average rectal temperature is 36.85 °C Relative to the average rectal temperature, other parts of the body are: Mouth -0.45 to -0.30 Esophagus -0.30 to -0.20 Stomach -0.20 to -0.10 Vagina -0.05 to +0.05 Brain -0.25 to +0.05 Human Body Temperature: Its Measurement and Regulation Table 5.2 For more information see Estimating changes in mean body ...


7

The show 'Monster Inside Me' actually has documentation of an older man with respitory problems who did asperate a raw pea and it did germinate and start to grow inside his lung. It was removed on the 3rd Bronchisotomy trying to get a biopsy. All germination requires is moisture, warmth and oxygen. Any seed could do this, although it would not get very ...


7

This is a well known urban legend. This letter published on Chest Journal addresses the issue Trees Don't Grow in the Lungs! - Chua and Mehta, 2009 We would like to bring to the attention of readers that trees do not grow in humans. To the best of our knowledge, there has never been a single report in the medical literature of seeds and/or plants ...


5

There are similarities The Wikipedia article on foreskin states... Eight weeks after fertilization, the foreskin begins to grow over the head of the penis, covering it completely by 16 weeks. At this stage, the foreskin and glans share an epithelium (mucous layer) that fuses the two together. It remains this way until the foreskin separates from the ...


5

This topic is actually discussed in a physics lecture found on MIT OpenCourseWare. You can enjoy Prof. Walter Lewin do an experiment showing that a person is taller laying down vs. standing up: http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/lecture-1 The relevant part starts at about 5:20


5

If there is an effect of breast size on milk production, it is not a large one. The Influence of Breast Surgery, Breast Appearance, and Pregnancy-Induced Breast Changes on lactation Sufficiency as Measured by Infant Weight Gain, Marianne Neifert, M.D., Sandra DeMarzo, C. H.A., M.S., Joy Seacat, C. H.A., M.S., David Young, M.S., Marilyn f eK M.S. W., M.S.P. ...


4

@Sklivvz posted a good back of the envelope theoretical answer, but it is off by a factor of 10 for the following reason: An estimation of the number of cells in the human body Annals of Human Biology (2013) finds that the number of cells in the human body is: 3.72 × 1013 of which 2.63 × 1013 are erythrocytes (red blood cells which do not have DNA) and ...


3

The sources from the OPs question are ‘naturally’ (and) dubious. Both in their presentation and claims. For ‘cleaning a kidney’ a human body needs adequate amounts of water. Calling a concept relating to internal medicine a “cleansing” seems like a surefire way to indicate quackery. If the goal is to keep the kidneys in a good, healthy, working condition ...


3

No, the right half of the field of vision goes to the left brain, and vice versa. A quick search showed up a book by a Harvard professor with this quote: A massive stroke in the left side of the brain leads to paralysis and lack of sensation in the right face, arm, and leg and to loss of speech. What is less commonly known is that such a stroke generally ...


2

According to URETHRAL DIVERTICULA by Eric S. Rovner: Peters and Vaughn [reference 30] found a strong association between concurrent or previous infection with Neisseria gonorrhea and urethral diverticula. This and other sources explain that stress incontinence is one of the symptoms of urethral diverticulum. "Peters and Vaughn" is Urethral ...


2

Yes, humans can move their eyes independently... just watch these videos (link 1 and link 2). But, how much use is that? What can you see if you cross your eyes? I know when I do it that crossing eyes serves very little purpose other than to help with pulling faces :) Everything just goes blurry and my eyes start to hurt. One reason our eyes have evolved ...


1

Yes, but partial-rotations have more severe effects when transitioning between one perceptual mode and the other. See this wonderful exposition by Steve Mann who spent many years immersed in a virtualized perceptual environment. He found that using a 90 degree rotation of the visual field eased transition from normal vision into the apparatus-space. Pic ...


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