Unanswered Questions

5,378 questions with no upvoted or accepted answers
22 votes
0 answers
423 views

Effect of Aging on SA node's sympathetic fibers

I am trying to understand the effect of aging on the sympathetic fibers of SA node. I know that aging shifts the vagal curve to left in frequency due to aging. However, I am interested if aging has ...
17 votes
0 answers
290 views

Does vaccination lead to short-term secondary infection suceptibility?

For clarity, here is a summary of my question, per anongoodnurse's comment: Does a lower peripheral lymphocyte count resulting from recent immunization render us more susceptible to infection by other ...
17 votes
0 answers
526 views

Identifying Some Kind Of Fossil

This was found off the coast of Ireland by a friend of mine. The running gag is it's some kind of fetish or totem and should be immediately discarded, but we're interested in whether it's perhaps a ...
15 votes
1 answer
2k views

Deliberately choosing one nostril to breathe through

James Nestor, on pp. 41-42 of his book Breath: the New Science of a Lost Art, claims the following. The right nostril is a gas pedal. When you're inhaling primarily through this channel, circulation ...
14 votes
0 answers
209 views

Is it known how some heat-resistance Bacillus spores repair their DNA after having been heated to 420 °C? (but not much higher)

Background Discussions below several recent posts in Space SE (links below) indicate that bacterial spores are a serious problem when considering how to prevent a future spacecraft mission to ...
13 votes
2 answers
279 views

Are there certain symmetric-pair muscles that are slightly bigger and NOT due to handedness?

Ok, hear me out, I was just thinking about an article in Nature I read in the past titled "Scrotal asymmetry in man and in ancient sculpture"$^{\dagger}$ and more recently an entire medical textbook ...
12 votes
0 answers
2k views

What is, (and what isn't) "kinetic replication" as it applies to molecules and to living organisms?

CNN's World's first living robots can now reproduce, scientists say describes "xenobots"; clusters of stem cells that move around and by this motion occasionally push enough free stem cells ...
12 votes
0 answers
149 views

How do the biophysics of how cerebrospinal fluid mechanically protects the brain work?

The two mechanisms I've seen mentioned are the cerebrospinal fluid (CSF) acting as a hydraulic cushion or shock absorber, and how CSF creates a micro-gravity environment through buoyancy. I have very ...
12 votes
0 answers
415 views

Anatomical Angle Made by the Fingers of an Extended Palm

Does the angle made by the fingers (excluding the thumb) of an extended palm (as shown in the figure below) have a name (such as the Lovibond or Cobb angle, for instance) ? I have already checked ...
12 votes
1 answer
970 views

Why do we like music?

Music is, of course, just a sequence of sounds. Sounds are vibrations in the air, which our ears detect. So why do we find certain sequences of sounds to be appealing? What makes us want to hear these ...
11 votes
0 answers
111 views

The almost extinct dinosaurs

Dinosaurs split into "lizard-hipped" and "bird-hipped" dinosaurs. Of these two groups, only the "lizard-hipped" (Saurischia) survived (these names are backwards). Of ...
11 votes
0 answers
73 views

What actually kills a plant that requires winter dormancy if it is kept indoors all year?

In bonsai practice, beginners will commonly purchase a juniper (often Juniperus procumbens 'Nana'), which is an outdoor tree, and keep it inside all year. The tree invariably dies. It is commonly ...
11 votes
0 answers
203 views

Identification of an animal building

I live in south-west Germany and today while mowing the lawn I discovered a strange structure. It looks like a molehill on which additional branches were placed. This kind of branches are easy to find ...
11 votes
0 answers
289 views

ID request ~2mm insect monstrosity

This tiny monstrosity (~2mm in length) was inside of some kind of "flat tent cocoon" on a pepper plant leaf in Washington state, USA. Not sure what's going on here. Is it malformed or infected?
11 votes
0 answers
180 views

Where does Darwin state his "principle of multiple utility"?

I have never heard of Darwin's 'principle of multiple utility', but several papers refer to it. For example, from Darwin at the molecular scale: selection and variance in electron tunnelling proteins ...

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