Showing posts with label interesting fact. Show all posts
Showing posts with label interesting fact. Show all posts

Monday, October 25, 2010

Biblical Analysis: Samson's Death

25 While they were in high spirits, they shouted, "Bring out Samson to entertain us." So they called Samson out of the prison, and he performed for them.
When they stood him among the pillars, 26 Samson said to the servant who held his hand, "Put me where I can feel the pillars that support the temple, so that I may lean against them." 27 Now the temple was crowded with men and women; all the rulers of the Philistines were there, and on the roof were about three thousand men and women watching Samson perform. 28 Then Samson prayed to the LORD, "O Sovereign LORD, remember me. O God, please strengthen me just once more, and let me with one blow get revenge on the Philistines for my two eyes." 29 Then Samson reached toward the two central pillars on which the temple stood. Bracing himself against them, his right hand on the one and his left hand on the other, 30 Samson said, "Let me die with the Philistines!" Then he pushed with all his might, and down came the temple on the rulers and all the people in it. Thus he killed many more when he died than while he lived. Judges 16: 25-30

I don't think I've ever seen two structural pillars close enough for a single person to put a hand on both at the same time. Consequently, the preceding passage has always made me wonder about the temple Samson died in. Especially after reading it as an adult: What kind of temple can hold three thousand people on the roof and still have two critical supports that close together? I figured someone out there had already done the research, what with it being in the Bible, and the Bible being the most popular book ever.

I wasn't disappointed. John Roskoski, PhD, seems to have written quite a bit on the subject. I first found his paper that describes the size of the temple, among other things. It was "26 feet wide by 47 feet long," according to Dr. B.G. Wood, as quoted by Roskoski. "The pillars would be within the reach of Samson, a huge man according to most scholars, as they were situated approximately six feet apart." This is based on the excavation of Tell Qasile, which is believed to be very similar to the temple in Gaza. With that question somewhat answered, I moved on to the three thousand people on the roof. A roof that is definitely too small for three thousand people.

John Roskoski's article on Samson's death addressed the number of people in the section appropriately titled "How Many People?"
The Hebrew term ‘elep represents the numeral 1,000. However, there are several specialized meanings attached to this term. One meaning is that the term represents the “largest basic division of leadership in political oversight or military leadership.” Also, “it is occasionally alleged that since ‘elep means a company of a thousand men it could mean any military unit, even of reduced strength” (Scott 1980: 48). Therefore, it seems as though the text is referring to three distinct contingencies that were in attendance, in addition to the followers of Dagon who filled the temple.
I have no way of really evaluating the information in that section. For now, I will accept it as it is. I will say that it doesn't strike me as a particularly strong argument, though. It seems odd to have to use some specialized meaning of a word in order for it to make sense. We go from "three thousand men and women" to "three distinct contingencies." It seems rather vague.

For the record, my favorite fact comes from a footnote in the first paper by Roskoski: "The columns were wider at the top and tapered at the bottom, a result of inverting the cypress trunk so to prevent sprouting once in place." I had no idea that was a problem, and I love the mental image that comes to mind when imagining some engineer encountering that problem for the first time.

Monday, August 30, 2010

72 Hours Slightly Less Wasted

As I mentioned in my analysis of brain speeds post, I spent about 72 hours reading and researching various articles and topics. In my quest for facts on the physiology of the brain related to a few specific statistics, I stumbled upon some other very interesting (to me) facts. I thought I should go ahead and share them if for no other reason than to help justify that 72 hours a bit more.
  • Single sodium pump maximum transport rate = 200 Na ions/sec; 130 K ions/sec
    Typical number of sodium pumps = 1000 pumps/micron2 of membrane surface (from Willis and Grossman, Medical Neurobiology, Mosby, St. Louis, 1981, p. 36)
    Total number of sodium pumps for a small neuron = 1 million[1]
    -- That's a lot of ions being transferred. I wonder how that compares with the best methods we've been able to engineer.... I'll try to resist the urge to make this into another blog post.
  • Seasonal oscillations in neuron number in the song nuclei of canaries correlates well with singing ability (Goldman & Nottebohm 1983).[2]
    -- Canaries kill off parts of their brain and regrow it regularly. Awesome! Practically speaking, adult neurogenesis can probably be induced, possibly helping people recover from various brain injuries.
  • Conversely, in some instances increased neuron number has been shown to result in improved performance. Exposure of immature frogs and rats to excess growth hormone can boost neuron number 20 to 60% according to Zamenhof and colleagues (1941, 1966), and in several instances the hyperplasia or hypertrophy is correlated with improved performance on single-trial avoidance conditioning tasks (Clendinnen & Eayrs 1961, Block & Essman 1965). Similarly, the number of visual cortical neurons excited by one eye has been experimentally increased two-fold in both cats and monkeys, and this increase is associated with smaller receptive fields in visual cortex (Shook et al 1984). Preliminary work supports the idea that such experimental animals are able to resolve smaller differences in the offset between two lines than normal monkeys (M.G. MacAvoy, P. Rakic and C. Bruce, personal communication).[2]
    -- How long before we have growth hormone supplements for our kids to make them smarter? Is this more scary or awesome?
  • [Regarding axon transmission speeds] The higher the temperature, the faster the speed. So homoeothermic (warm-blooded) animals have faster responses than poikilothermic (cold-blooded) ones.[3]
    -- I've always wondered what the advantages to being warm-blooded are! This fact prompted me to read http://en.wikipedia.org/wiki/Warm-blooded#Warm-blooded_vs._cold-blooded, which was full of interesting facts (and the correct spelling of homeothermic).
  • Neurons in layer IV receive all of the synaptic connections from outside the cortex (mostly from thalamus)[4]
    -- The thalamus is the key to The Matrix. We must not teach the machines about the thalamus.
  • The longest axons in the human body, for example, are those of the sciatic nerve, which run from the base of the spine to the big toe of each foot. These single-cell fibers of the sciatic nerve may extend a meter or even longer.[5]
    -- Just pretty darn cool.

Now then, tell me an interesting fact. I don't mind reading more than one, if you have extra to share. I obviously have plenty of time to kill....

Sources:
  1. http://faculty.washington.edu/chudler/facts.html
  2. http://www.nervenet.org/papers/NUMBER_REV_1988.html
  3. http://www.biologymad.com/NervousSystem/nerveimpulses.htm
  4. http://en.wikipedia.org/wiki/Neocortex
  5. http://en.wikipedia.org/wiki/Axons