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The reason behind your emotions, according to Hippocrates
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Hippocrates (460–377 BC) postulated that the imbalance or excess of four fluids (called humors) within the body play a role in ones emotional and physical state. The chart below shows the four humors (row 1), the condition created by too much of each (row 2), and their respective emotions (row 3): The Hippocratic theory of personality popularized the practice of bloodletting — opening a vein or applying leeches to "drain off" excessive amounts of the troublesome humor. In medieval Europe, it was common for barber-surgeons (whose professional practice relied on sharp instruments like knives and razors) to advertise their bloodletting services by posting a sign depicting a pale human arm traced with a crimson spiral of blood. (Remember that a ...
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1724 |
bio_man |
A year ago |
Four color theorem
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The Four Color Theorem is a famous mathematical theorem that states that no more than four colors are required to color the regions of any map so that no two adjacent regions have the same color. Adjacent means that two regions share a common boundary curve segment, not merely a corner where three or more regions meet. Unlike other proofs before its discovery, computers were used to resolve this long-standing mathematical conjecture that was first proposed in 1850 by Francis Guthrie. After more than a century later, mathematicians, Kenneth Appel and Wolfgang Haken, finally derived its proof in 1976, and determined that it is practicality impossible for humans to verify it without the use of a computer. According to the four color theorem, a ...
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5300 |
bio_man |
2 years ago |
Top 5 Interesting Math Facts You Never Knew
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1) Roman Numeral IVAlthough the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better. 2) Base 60The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero." 3) Fraction BarThe Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole. It wasn't until later in h ...
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1233 |
bio_man |
5 years ago |
High school is done… now what?
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Millions of new high school graduates will soon be heading to college. Here are five tips for the summer ahead. Cue the Pomp and Circumstance.For most high school seniors, it's that time of year – the time when funny hats are thrown into the air to signal the end of sheltered bubbles and parental control, and the beginning of the path to expanded horizons. But if you were like me, the standard graduation song that everyone hears takes a back seat to your soon-to-be fight song that makes you distinct. Before you can step foot onto the college campus of your choice, however, you must spend three months in educational limbo. Sure, you'll be working, possibly taking a summer class or two and enjoying your weekends (be careful, kids), but through ...
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1480 |
bio_man |
6 years ago |
Watch how the ancient Babylonians tracked Jupiter in the sky
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It's hard to fathom the difficulties our ancestors had to contend with given how our world has advanced with technological sophistication over the past century. We shouldn't, however, underestimate the power of the human-mind, and how everything that was discovered in the past paved the way for the practices used today, especially those used in science. Of the very first astronomers, the ancient Babylonian were the first to use simple arithmetic to predict the positions of celestial bodies. Evidence reveals that these astronomers, working several centuries B.C.E., also employed sophisticated geometric methods that foreshadow the development of calculus. Historians had thought such techniques did not emerge until more than 1400 years later, ...
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5422 |
bio_man |
8 years ago |
This smart-watch came out 38 years before the Apple watch
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The 1977 HP-01 digital calculator was arguably the very first smart-watch to hit the market nearly 38 years before the Apple Watch. The watch was a marvel for its time. Not only could it perform basic calculations, the watch could do dynamic time and date calculations, algebra, and even function as a stopwatch and alarm clock. The watch in perfect condition can be found on eBay from time-to-time, for a price ranging up to $14 500 on eBay.
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5616 |
duddy |
8 years ago |
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4575 |
duddy |
8 years ago |
Who plays the octobass?
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The Octobass, an instrument invented in 1849, stands 11 feet 5 inches tall! It plays notes lower than humans hear.
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28838 |
duddy |
9 years ago |
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20745 |
duddy |
9 years ago |
Converse shoes are the best
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Originating in the late 1800s, the term "sneaker" referred to the near silent sound of walking in rubber soles.
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22039 |
duddy |
9 years ago |
What mechanism allowed early terrestrial animals to transition from water to land?
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A new study finds that Mudskipper fish carry water in their mouths in order to eat prey outside of water. As seen in the video below, the hidden water is expelled at the moment of eating and it serves as a suction to move the water and their meal back toward the esophagus. The water suction, or “hydrostatic” tongue, may serve as the evolutionary bridge that allowed our aquatic ancestors to begin feeding on land.
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36005 |
duddy |
9 years ago |
The African Renaissance Monument
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I bet you've never seen this statue before. Neither had I until today. It's "The African Renaissance Monument" in Dakar, Senegal. The monument stands at a height of approximately 49 meters (160 feet), including its base, making it one of the tallest statues globally. It was designed by Senegalese architect Pierre Goudiaby Atepa and was built by a North Korean company. The statue was inaugurated on April 4, 2010, during Senegal's 50 th independence anniversary celebration, and symbolizes Africa's emergence from a history of colonization and oppression and its progress toward a brighter future. ...
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104691 |
duddy |
9 years ago |
Queen Khentakawess and Osiris
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I am not sure if such blogs are welcome here, but I will try sparking enthusiasm in this subject. Alongside my major field of interest, I have an unhealthy/obsessive curiosity distortion in the archaeology field, specifically Egyptology. And recently, two major discoveries have been made in the Ancient Egyptian land. The first discovery made was that belonging to an Ancient Queen named Khentakawess's the 3rd's tomb, which was located near her husband's tomb, Pharoah Neferefre. These two, date back to the 4th or 5th dynasties, that is approximately 4000 years back in history. Around that time, the first three pyramids, yes, the ones that we see all the time and are the most famous pyramids of Giza, were being built by Pharoahs Khufu, his son ...
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13188 |
ehd123 |
9 years ago |
Einstein's letter to Curie
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This 103-year-old letter from Albert Einstein to Marie Curie tells her to ignore the haters.
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7238 |
duddy |
9 years ago |
We were born to fight
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The bones of the male human face evolved their shape to withstand fistfights, according to a recent scientific study.
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19158 |
duddy |
9 years ago |
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