Neurons are the nerver cells that are the major constituent of the brain. At birth the brain has the maximum number of neurons – 20 billion to 200 billions neurons. Thousands are lost daily, never to be replaced, and apparently not missed, until the cumulative loss builds up in very old age.
The color of blood is related to the compounds that transport oxygen. Hemoglobin, containing iron, is red and found in all vertebrates (animals having a backbone) and a few invertebrates (animals lacking a backbone). Annelids (segmented worms) have either a green pigment, chlorocruorin, or a red pigment, hemerythrin. Some crustaceans (arthropods having divided bodies and generally having gills) have a blue pigment, hemocyanin, in their blood.
[Source : The Handy Science Answer Book]
In magical lore and mysticism, all numbers are ascribed certain properties and energies. Seven is a number of great power, a magical number, a lucky number, a number of psychic and mystical powers, of secrecy and the search for inner truth. The origin of belief in seven’s powers lies in the lunar cycle. Each of the moon’s four phases lasts about seven days. The Summerians, who based their calendar on the moon, gave the week seven days and declared the seventh and last day of each week to be uncanny. Life cycles on Earth also have phases demarcated by seven, there are said to be seven years to each stage of human growth, and there are seven colors to the rainbow, seven notes in the musical scale, seven petitions to the Lord’s Prayer, and seven deadly sins. The seventh son of a seventh son is said to be born with formidable magical and psychic powers. The number seven is widely held to be a lucky number, especially in matters of love and money.
[Source : The Handy Science Answer Book]
To be honest, I thought Mark Twain was just the name that Samuel Clemens used for his books. I had no idea it actually meant somethig else!
“Mark twain” is a riverboat term meaning two fathoms (a depth of 12 feet or 3.6 meters). A hand lead is used for determining the depth of water where there is less than 20 fathoms. The lead consists of a lead weight of 7 – 14 pounds (3 – 6 kg) and a line of hemp or braided cotton, 25 fathoms (150 feet, 46m) in length. The line is marked at 2, 3, 5, 7, 10, 15, 17 and 20 fathoms. The soundings are taken by a leadsman who calls out the depths while standing on a platform projecting from the side of the ship, called “the chains.” The number of fathoms always forms the last part of the call. When the depth corresponds to any mark on the lead line, it is reported as “By the mark, 7,” for example. If bottom is not reached, the call is “No bottom at 20 fathoms.”
“Mark Twain” was also the pseudonym chosen by American humorist Samuel Clemens, supposedly because of its suggestive meaning, since it was a riverman’s term for water that was just barely safe for navigation. One implication is that “barely safe water” usually made people nervous, or at least uncomfortable.
[Source : The Handy Science Answer Book]
Most people would assume that a pound of gold is heavier…after all, it’s a metal, and feathers are inherently light. The trick here, though, is that the system for measuing weight is different for the two objects. Gold is measured using troy pounds, while feathers are measured using avoirdupois pounds. A troy pound has 12 ounces; avoirdupois pounds have 16 ounces. A troy pound contains 372 grams in the metric system; an avoirdupois pound contains 454 grams. Each troy ounce is heavier than an avoirdupois ounce. Thus, a pound of feathers weighs more than a pound of gold!
[Source : The Handy Science Answer Book]
The eye’s retina is part of the brain, and the retina’s cells are derived from brain tissue. Retinal cells and the cells that connect them to the brain are the least amenable to being manipulated outside the body. That is why we cannot currently do eye transplants.
[Source : The Handy Science Answer Book]
The stomach holds a little under two quarts (1.9 liters) of semi-digested food that stays in the stomach three to five hours. The stomach slowly releases food to the rest of the digestive tract. Fifteen hours or more after the first bite started down the alimentary canal, the final residue of the food is passed along to the rectum and is excreted through the anus as feces.
[Source : The Handy Science Answer Book]
In tribute to the Large Hadron Collider, we learn today that absolute zero is the theoretical temperature at which all substances have zero thermal energy. Absolute zero is equivalent to 0 degrees Kelvin, -459.67 degrees F, or -273.15 degrees C.
Originally conceived as the temperature at which an ideal gas at constant pressure would contract to zero volume, absolute zero is of great significance in thermodynamics and is used as the fixed point for absolute temperature scales.
The Large Hadron Collider supercools the magnets it uses to 1.9 degrees K. That’s pretty darn cold!
[Source : Wikipedia and The Handy Science Answer Book]
I found this image to be pretty amazing…I bet you do too!
Ever wonder what a square foot, or a yard equals in "sensible units?" As in things that really matter? Well, head over to sensibleunits.com and you can find out things like:
The possibilities are endless…give it a shot!