Unanswered Questions
5,846 questions with no upvoted or accepted answers
23
votes
1
answer
485
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 ...
CommunityBot
- 1
17
votes
0
answers
594
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 ...
- 116
16
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 ...
- 103
15
votes
0
answers
243
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
0
answers
186
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 ...
- 313
13
votes
1
answer
266
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 ...
- 116
13
votes
2
answers
297
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 ...
- 9,112
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
329
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?
- 2,455
12
votes
0
answers
444
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 ...
- 229
12
votes
1
answer
379
views
I am trying to identify this plant
I am trying to identify this medium arching shrub growing to about 1.5m high x 2m wide in the subtropical climate of the Mt Coot-tha Botanic Gardens in Brisbane, Australia. Unfortunately there was no ...
- 1,077
11
votes
0
answers
133
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 ...
- 1,266
11
votes
1
answer
137
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 ...
CommunityBot
- 1
11
votes
0
answers
249
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 ...
- 2,351
10
votes
1
answer
695
views
Identify this vertebra
I was walking on the beach in New Jersey (U.S.), at about 40 degrees longitude, and found this bone. It's not a fish. The long process in the front is interesting. It is likely a C2 vertebra. I looked ...
- 7,637