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Questions tagged [biology]

Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy.

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Is the human menstrual cycle related to the lunar cycle?

I've heard that the female menstrual cycle follows a pattern of the lunar cycle, mostly as an evolutionary adaptation so that menstruation (and hence detectability by predators because of the smell of ...
20
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1answer
2k views

Can one die of fear?

Is it scientifically possible for someone to die of fear? I'm sure someone can be scared enough to have a heart attack or something, but is it possible for the brain to shut down as a defense ...
11
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1answer
2k views

The starchild skull

A program on History Channel describes an allegedly non-human skull found in mexico, called the starchild skull. From http://www.starchildproject.com/: THE STARCHILD SKULL is a genuine 900-year-...
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3answers
750 views

Are yawns contagious?

I guess that this might be a little bit of an extension of the question "Is yawning contagious across species" that was earlier asked. But my question is, is yawning contagious at all? Is there any ...
34
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5answers
4k views

Does DNA add credibility to the theory of evolution?

I have yet to make up my mind regarding the theory of evolution. Whilst doing some reading on dnafish I read that DNA itself provides evidence for the theory of evolution: Yeast, trees, flowers, ...
17
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2answers
868 views

Are animal experiments unnecessary for toxicological studies?

I've heard from animal rights activists that experiments on animals are not necessary because we can get the same or better results from cell culture experiments. An example of that claim is this ...
16
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1answer
867 views

Do silicone breast implants cause health problems?

An article in Business Week Magazine (June 10, 1991, but can't yet find a link) kicked off a debate that raged throughout the 90's. It stated that silicone breast implants manufactured by two Big ...
18
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1answer
8k views

Are cramps and muscle soreness caused by Lactic Acid?

I commonly hear that muscle cramps are caused by lactic acid. For instance, this article indicates: Another cause of muscle cramps can be the build up of lactic acid in the muscles. However, ...
46
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4answers
8k views

Do men think about sex every 7 seconds?

I'm sure most of us have heard at least a variation of this myth. Unfortunately I failed to find the original source. Was there actually a study that claimed this? A lot of the sites debunking this ...
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3answers
4k views

Is yawning contagious across species?

The Mythbusters have "confirmed" the contagiousness of yawning between humans and this study concludes it may be part of a neural network involved in empathy. This hypothesis is supported by ...
59
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4answers
6k views

Is there any explanation for a near-death experience?

One idea I used to hear a lot about was that when people are near-death and saved by medical science that they sometimes see "a light at the end of a tunnel" in a vision. Today I read about an ...
76
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5answers
13k views

Were people shorter in the middle ages?

In many castles or museums you'll find medieval armor, belonging to a knight. Those are often very small compared to the average human nowadays. I've heard this explained multiple times as being due ...
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5answers
3k views

Are humans the only species that hunts down competitors, denies and destroys food for others?

In the book Ishmael, there's a passage that claims "Takers" (i.e. modern man) are the only thing in nature that hunt down competitors, destroy or otherwise deny someone else food. Are there strong ...
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2answers
3k views

Is there a deep, hot biosphere?

Thomas Gold claims that oil is not aging vegetal or animal matter, but rather made continously from bacteria deep in the Earth's mantle (a 'deep hot biosphere') so that we would effectively never have ...
20
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1answer
14k views

Do we lose 7 pounds when we die?

I often hear people claim that it is a fact that humans lose seven pounds when they die. Some people believe that this is 'proof' of the existence of the 'soul'. Is there any truth to this claim? I ...
22
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2answers
900 views

Did a NASA study show that arsenic-based bacteria are possible?

A while ago a NASA funded study claimed that they could get bacteria to incorporate arsenic into their DNA. Life forms based on different elements than life on earth have been speculated about in ...
24
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1answer
10k views

Do you need to twist a tick out counter-clockwise?

I was told many times when I was little that if you don't twist ticks counter-clockwise and instead just jerk them out, the head goes into your bloodstream and can be dangerous. It wasn't until ...
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9answers
8k views

Is race a discredited scientific concept in biology?

I've heard lots of people say things like "race doesn't exist" and "race has no biological meaning." On the other hand, I've heard lots of disagreements too, from scientific popularizers like Steven ...