Ishango bone The Ishango bone is a bone tool, dated to the Upper Paleolithic era. It is a dark brown length of bone, the fibula of a baboon, with a sharp piece of quartz affixed to one end, perhaps for engraving. It was first thought to be a tally stick, as it has a series of what has been interpreted as tally marks carved in three columns running the length of the tool, but some scientists have suggested that the groupings of notches indicate a mathematical understanding that goes beyond counting. It has also been suggested that the scratches might have been to create a better grip on the handle or for some other non-mathematical reason. The Ishango bone was found in 1960 by Belgian Jean de Heinzelin de Braucourt while exploring what was then the Belgian Congo. It was discovered in the African area of Ishango, which was centered near the headwaters of the Nile River at Lake Edward (now on the border between modern-day Uganda and Congo). Possible meaning Mathematical calculations
Time Travel and Modern Physics First published Thu Feb 17, 2000; substantive revision Wed Dec 23, 2009 Time travel has been a staple of science fiction. With the advent of general relativity it has been entertained by serious physicists. But, especially in the philosophy literature, there have been arguments that time travel is inherently paradoxical. The most famous paradox is the grandfather paradox: you travel back in time and kill your grandfather, thereby preventing your own existence. To avoid inconsistency some circumstance will have to occur which makes you fail in this attempt to kill your grandfather. 1. You are very depressed. 2. The standard worry about time travel is that it allows one to go back and kill one's younger self and thereby create paradox. Well, one worry is the question as to why such schemes always fail. 3. Imagine the following set-up. However, it does not take much thought to realize that there is no paradox here. Let us now be more general and allow color photography. Figure 1 Figure 2 4.
70 Things Every Computer Geek Should Know. | Arrow Webzine The term ‘geek’, once used to label a circus freak, has morphed in meaning over the years. What was once an unusual profession transferred into a word indicating social awkwardness. As time has gone on, the word has yet again morphed to indicate a new type of individual: someone who is obsessive over one (or more) particular subjects, whether it be science, photography, electronics, computers, media, or any other field. A geek is one who isn’t satisfied knowing only the surface facts, but instead has a visceral desire to learn everything possible about a particular subject. How to become a real computer Geek? Little known to most, there are many benefits to being a computer geek. You may get the answer here: The Meaning of Technical Acronyms 1. One of the best list of default passwords. 1A. 2. If you rolled your eyes here, that is a good thing. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21.
Sleep Is Death (Geisterfahrer) Infographic of the Day: How the Global Food Market Starves the Poor To understand the complexities of the international food market--and how traders in Chicago can cause Africans to starve--you could get a ph.D. in economics, or read a 400-page report from the World Bank. Or you watch this superb nine minute video, directed by Denis van Waerebeke. Though ostensibly created for a science show in Paris for 12 year olds, it's actually probably waaaay over a kid's head. Just watch--it's excellent, and very well illustrated: The video begins with a basic question: How is it that the first world has an oversupply of food, while 1 in 7 in the world go malnourished? That can have disastrous effects. The solutions will involve everyone, the world over. Still hungry for more infographics videos? [Via Infosthetics]
CRACKED: 6 Things Your Body Does Every Day That Science Can't Explain The human race has scaled the tallest mountains, charted the deepest oceans and played a quick front nine on the freaking moon, but there's one frontier that still largely mystifies us: our own bodies. There are everyday phenomenons you'd think must have been explained ages ago, but in reality asking these simple questions of a scientist will net you at best a shrug, and at worst some bullshit he just made up off the top of his head. The act of yawning is baffling to experts for two reasons. One, it doesn't actually seem to serve any purpose. Seriously, when you feel a yawn coming on, suppress it. What happens? Equally baffling, though, is the contagious nature of it. Odds are you've yawned once just because you read the word "yawn" several times above. Science's Wild-Ass Guess: Your science textbook in elementary school may have said that low oxygen levels in the blood triggered yawning, with the yawn providing a quick influx of the gas. Yeah, a tie, that'll do it. What the hell?
The concerns of a mouse… A mouse looked through the crack in the wall to see the farmer and his wife open a package. “What food might this contain?” The mouse wondered. He was devastated to discover it was a mousetrap. Retreating to the farmyard, the mouse proclaimed this warning : “There is a mousetrap in the house! The chicken clucked and scratched, raised her head and said, “Mr. The mouse turned to the pig and told him, “There is a mousetrap in the house! The pig sympathized, but said, “I am so very sorry, Mr. The mouse turned to the cow and said, “There is a mousetrap in the house! The cow said, “Wow, Mr. So, the mouse returned to the house, head down and dejected, to face the farmer’s mousetrap. … Alone That very night a sound was heard throughout the house – the sound of a mousetrap catching its prey. The farmer’s wife rushed to see what was caught. In the darkness, she did not see it. It was a venomous snake whose tail was caught in the trap. The snake bit the farmer’s wife. The farmer rushed her to the hospital.
30 Habits that Will Change your Life Developing good habits is the basic of personal development and growth. Everything we do is the result of a habit that was previously taught to us. Unfortunately, not all the habits that we have are good, that’s why we are constantly trying to improve. The following is a list of 30 practical habits that can make a huge difference in your life. You should treat this list as a reference, and implement just one habit per month. Health habits Exercise 30 minutes every day. Productivity habits Use an inbox system. Personal Development habits Read 1 book per week. Career habits Start a blog. What do you think? Update: A reader put together a downloadable copy of all these habits.
The 5 Strangest Things Evolution Left in Your Body If you don't believe in evolution, you have to spend a lot of time wondering about the useless shit the creator threw into our bodies. Why don't our wisdom teeth fit in our heads? Why do we need an appendix? The answer is that evolution is a sloppy and haphazard process. Take a close look at your body and you'll see some of the leftover junk. Like... There is a little girl standing behind you with dark, sunken eyes and a deadpan expression. Did you feel that slight tingling sensation on the back of your neck? But mostly when scared and 11. They can also appear when we feel sexually aroused or when we feel in awe of something, like listening to a moving piece of music, or if you're the type, watching monster trucks smash smaller cars (to each his own). But Why? Ever see the fur on the back of a scared or angry animal suddenly stand straight up? It's that. Like this. There is really no reason to have this reaction anymore as it's of no use to us. Above: not bear-food. For... um, warmth.
Table of contents (With last update date) Cover Foreword (August 13, 2009) Part 1. Preface to part 1 (April 12, 2000) Chapter 1. 1.1. 1.6. 1.7. Chapter 2. 2.1. 2.2. 2.3. 2.4. 2.5. 2.6. Chapter 3. 3.1. 3.2. 3.3. 3.4. Chapter 4. 4.1. 4.2. 4.3. 4.4. Chapter 5. 5.1. 5.2. 5.3. 5.4. 5.5. 5.6. 5.7. 5.8. 5.9. 5.10. 5.11. 5.12. 5.13. 5.14. 5.15. 5.16. Chapter 6. 6.1. 6.2. 6.3. 6.4. 6.5. 6.6. 6.7. 6.8. 6.9. 6.10. 6.12. Part 2. Preface to part 2 (October 17, 2010) Chapter 7. 7.1. 7.2. 7.3. 7.4. 7.5. 7.6. 7.7. 7.9. 7.10. Chapter 8. 8.1. 8.2. Chapter 9. 9.1. 9.2. 9.3. 9.4. 9.6. Chapter 10. 10.1. 10.2. 10.3. 10.4. Chapter 11. 11.1. 11.2. 11.3. 11.4. 11.5. 11.6. 11.7.The victim/victimizer polar pair 11.8. 11.9. 11.10. Chapter 12. 12.1. 12.2. 12.3. 12.5. 12.6. 12.7. Chapter 13. 13.1. 13.2. 13.3. 13.4. 13.5. 13.6. 13.7. 13.8. 13.9. 13.10. 13.11. 13.12. 13.13. Chapter 14. 14.1. 14.2. 14.3. 14.4. 14.5. 14.6. 14.7. 14.8. Chapter 15. Chapter 16. 16.3. 16.4. 16.5. Part 3. Preface to part 3 (November 18, 2009) Chapter 17. 17.1.
Adam and Eve: Adam's rib count. Claim CB381: As related in Genesis 2, Eve was created from one of Adam's ribs. As a consequence, men have one fewer set of ribs than women do. Source: reported by Root-Bernstein, 1995. (see below) Response: Men and women have the same number of ribs. References: Gilbert, Scott F. and Ziony Zevit. 2001. Further Reading: The Socratic Method The Socratic Method:Teaching by Asking Instead of by Tellingby Rick Garlikov The following is a transcript of a teaching experiment, using the Socratic method, with a regular third grade class in a suburban elementary school. I present my perspective and views on the session, and on the Socratic method as a teaching tool, following the transcript. The class was conducted on a Friday afternoon beginning at 1:30, late in May, with about two weeks left in the school year. This time was purposely chosen as one of the most difficult times to entice and hold these children's concentration about a somewhat complex intellectual matter. The experiment was to see whether I could teach these students binary arithmetic (arithmetic using only two numbers, 0 and 1) only by asking them questions. I had one prior relationship with this class. "But what I am really here for today is to try an experiment with you. 1) "How many is this?" 2) "Who can write that on the board?" 4) Another way? 5) Another way?
Ancient Hunter-Gatherers Kept in Touch Until about 8500 years ago, Europe was populated by nomadic hunter-gatherers who hunted, fished, and ate wild plants. Then, the farming way of life swept into the continent from its origins in the Near East, including modern-day Turkey. Within 3000 years most of the hunter-gatherers had disappeared. Little is known about these early Europeans. But a new genetic analysis of two 8000-year-old skeletons from Spain suggests that they might have been a remarkably cohesive population both genetically and culturally—a conclusion that other researchers find intriguing but possibly premature. The first modern human hunter-gatherers occupied Europe at least 40,000 years ago. Yet, while researchers have intensively studied the ancient farmers who followed them, relatively little is known about Europe's Mesolithic people. The team was able to extract mitochondrial DNA (mtDNA) from both sets of remains, and to completely sequence the mtDNA from the La Braña 1 skeleton.