Essay --

Nuclear power is a relatively new method of supplying the ever growing population with the electricity that is required. Although the majority of people are unsure of how generation occurs, nuclear power provides roughly 17% of the world’s power. (Rich, Alex K...) This makes nuclear power a deciding factor in how the race progresses in technology and energy fabrication as it is able to produce mass amounts of electricity in short periods of time. The limit potential for nuclear power is unclear in not only energy but also weaponry and some medical uses. The fact that uranium and the radioactivity that comes with it are used in facilities and other inventions often lead people to distrust the inventions which, while not entirely un-called for, hinders progress and leads to fables and tales around nuclear energy, its creation, and the nuclear power plants that are springing up around the world. This causes nuclear facilities to slow in their development which only makes things w orse because as things progress the facilities will only get increasingly safe as long as they are handled professionally. (Rich, Alex K†¦) Some of the slanderous fables around nuclear power include things like claiming that nuclear facilities cannot operate during droughts and water shortages. (Kharecha, Pushker†¦) While nuclear power is accompanied by several risks, it can also be the solution for various global strains and difficulties. Nuclear power is generated through a process known as nuclear fission which occurs when the uranium molecules are placed in the water. This process causes the water to heat up to boiling point and generates steam, from there it operates like most other power plants by using the steam to turn turbines and create energy. Stea... ...ut. It has been shown that raising passive temperatures in a nuclear facility by only one degree Celsius reduces the production amount by 0.4%. (Linnerud, Kristin) Nuclear power may lead to some extensive breakthroughs in multiple fields for better or for worse in the case of humanity and its survival. It’s a topic that people need to take a bit more seriously as it holds the chance to make or break the future for earth and its inhabitants. Greater risks have greater rewards and as observance of nuclear products and ideas deepen then so do the products yield, perhaps into infinity. While nuclear power is accompanied by several risks, it can also be the solution for various global strains and difficulties. Sufficient energy for the world is a huge goal to tackle and requires the use of any efficient resource we have, especially when the source has so much potential.

Genographic Project Informative Speech

The Genographic Project I. INTRODUCTION A. (attention grabber): Everyone here probably knows what ethnicity you are, where your immediate family came from, or maybe can even trace your great-great grandparents. But what if I told you that you can find out where your ancestors came from tens of thousands of years ago from using this! (hold up a cotton swab) B. (thematic statement): Today I will be talking to you about The Genographic Project and what it has discovered in terms of ancestry. C. (establish significance/credibility): National Geographic has been conducting the Genographic Project since 2005. Consider the following article: Informative Speech on African CultureThey have been collecting DNA samples from people, and by studying and grouping the genetic markers people possess, it can be determined which path your ancestors took when populating the world! It can answer why we ended up where were are, and why there is a wide variety of colors and features amongst humans. Now, what I am going to be talking to you about today is National Geographic’s Genographic Project only, because the scientific community has not come to a concensus that their findings are valid, and the project is still ongoing. D. preview of main points): (pic) So today I will explain to what the National Geographic Genographic Project is, how it is being conducted, what their findings are, and how you can be a part of it. [transition]: But first, let’s talk about what this Genographic Project is, and a little about the science behind it. II. BODY A. (main point #1): In 2005, National Geograph ic Genographic Project was launched. a. According to National Geographic News. Com, Dr. Spencer Wells (pic)and a team of scientists are using technologies to uncover the truth of our genetic roots.They are analyzing patterns in DNA from participants worldwide that can tell us where we came from. He created the project to further validate his previous research about where humans came from. There is great debate about where humans originated and the paths they took to populate the world. http://news. nationalgeographic. com/news/2002/12/1212_021213_journeyofman. html b. According to Genographic Project website, So lets get into a little science†¦here’s how it works: Fathers pass on Y chromosomes to their sons, and for Mothers and daughters, its different. Mothers pass mitochondrial DNA to their daughters, and their sons.This â€Å"genetic code† becomes varied through the generations through occasional mutations. When a mutation occurs, it becomes a marker that can b e traced, and serve as genetic signposts for tracing evolution. Scientists, like Dr. Wells, can actually follow markers through time and determine the earliest ancestor for each marker. These markers in our genes can also help us to chart human migrations from Africa to other continents. The markers continue to split and split and you can eventually identify the root of all these branches to a common ancestor in Africa. ttps://genographic. nationalgeographic. com/science-behind/genetics-overview/ [transition/with signposting]: Ok, Now we have an idea of what it is and the science behind it, let’s take a look at How they are doing it and what they found. B. (main point #2): How it is being conducted- The Results they are finding. a. Dr. Wells and his team are obtaining DNA samples from ordinary people like you and me, and they are also traveling around the world to indigenous peoples and traditional cultures and obtaining DNA samples from them also.He is focused on obtaining v ery different samples of DNA to get the complete picture. https://genographic. nationalgeographic. com/about/ b. As can be seen in The Human Family Tree, (a documentary about this project), (pic)the team set up a booth at a street fair in Queens. Imagine the diversity they found in that one street that day. They took DNA samples from various people and contributed the samples to the project. (They did share their findings with the people who participated weeks later) (Movie source: The Human Family Tree- National Geographic) . The Results are amazing. (pic) They were able to chart a road map of sorts to identify the roots that people took when they migrated out of Africa, by grouping the markers they found in the DNA that was collected. (talk about chart/map and how to identify the markers) https://genographic. nationalgeographic. com/human-journey/ d. They estimate that all humans alive today can trace their DNA back to a woman who lived in Africa between 150,000 and 170,000 years ago. pic) She wasn’t the first human, of course, but when you trace the markers in our DNA, it ends with her. That means that all other lineages have died out prior to hers, and her genetic marker lived on and is in each and every one of us. http://www. oldthingsforgotten. com/dna/mtdna. htm [transition /with signposting]: Ok, let’s move on to how you can join in too, now that we know what the results are. C. (main point #3) How you can help/join a. (pic) If you’ve got about $200 bucks, you can purchase Geno 2. – Genographic Project Participation and DNA Ancestry Kit, in which you will receive these really fancy cotton swabs, and an envelope to return the results back to National Geographic. Let’s not forget you can keep the box as a keepsake! A portion of the proceeds from selling the kid goes back into the project for funding. You can then join their website, and your results will be posted there. You can also interact, if you upgrade your accoun t, with various other people with the same genetic markers as you- Distant Cousins! http://shop. ationalgeographic. com/ngs/browse/productDetail. jsp? productId=2001246&gsk&code=MR20936 b. So basically, what you can expect to find out is which root your genetic markers indicate you traveled. (back to map)So in a sense, you will find out which â€Å"highway† your ancestors took around the world. So for instance, (talk about African-American gentleman who’s roots did not indicate what he thought it would). III. CONCLUSION A. (review of main points): So today we have learned about what the Genographic Project is, how it is conducted and what the results are.Plus we are all going to run straight to the nearest computer and purchase the kit, right? B. (reminder of significance): National Geographic has been instrumental in documenting and researching all kinds of things around the world with respect to human and animal populations, across the globe. This project is no diffe rent. They have the resources and the scientists behind the research to determine where we all came from. C. (dynamic closure): So I bet the next time you look at one of these (cotton swab), you will remember that it can used the solve the mystery about where you came from!

Essay on Physics of Rock Climbing - 1551 Words

Rock climbing is an exciting, but dangerous, sport. Since the 70s, climbing equipment has become more reliable and more safe. The physical laws behind rock climbing have not changed, but engineers have found ways to make safer and more reliable gear to help prevent a climber from falling. Rock climbing is all about physics. The main aspect of rock climbing is gravity. Gravity is what every rock climber faces every time they scale a wall. There are several forces involving rock climbing and they include friction, tensional force, and, of course, gravity. Friction is very important in rock climbing. If there was not friction, one would not be able to rappel or belay. Friction from the belay device assists in bleeding off some†¦show more content†¦The GriGri is great at stopping falls, but it does not allow for any rope slippage. What is great about the GriGri is it locks up automatically, much like a car seat belt, when a sudden force pulls on the rope. The bad thing about the Grigri is that if a climber has a serious fall, meaning from a great height, the climber comes to a sudden halt absorbing more of the energy. Increasing the deceleration time reduces the force. The Gri Gri has no deceleration time, which creates a high force that acts on the climber, rope, and anchor system. There are several devices that can be used to belay a climber. They all work using the same principle, by creating a frictional force to stop a fall or to bring someone to the ground. The rope passes through the belay device, then the free arm with the loose, tail end of the rope is swung back, preferably behind the back to provide the most possible friction on the belay device. The greater the angle between the two parts of the rope, the more frictional force there is in stopping a fall. Falling can hurt. It can be scary as well, especially when you are the lead climber and you are above your last piece of safety. When that is the case, the distance you fall can be twice as long than when you are below your last bolt. As you know, gravity acts on all objects with a downward pull towards the center of the earth. This downward force gives a climber energy. When climbers fall, theShow MoreRelatedMovie Report : Wild Walls Climbing Gym, Spokane, Washington. Photo2433 Words   |  10 Pagesthe previous page were taken at Wild Walls Climbing Gym in Spokane, Washington. Photo #1 exhibits a climber while on the rock wall, supporting his own weight. Photo #2 displays the system employed by rock climbers to stay safe in the case of a fall. Two photos were taken in order to compare the system while the climber is on the wall and ascending against when the climber has fallen off the wall and is hanging by the rope. In the sport of rock climbing, the goal is, obviously enough, to reach theRead MoreTeaching Our Young Children Math And Science1052 Words   |  5 Pagesagain. 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She also joined the all-girlsRead MoreGrade 8 (K-12) Science Teachers Guide13696 Words   |  55 PagesFnet = 0. The object will not move. Newton’s Three Laws of Motion 1. Start the session by introducing first Isaac Newton to the students. Provide some pictures if possible. Discuss some of his significant contributions especially in the field of physics, e.g., Newton combined his ideas and the ideas of the other scientists like Galileo to give us a more unified picture of how our universe works. He formulated the laws of motion and gravitation. Through his three laws of motion, we can describe andRead MoreOutline Of A Thesis Statement3601 Words   |  15 Pagesexplain to you why you shouldn’t waste your money on tributes who will soon meet their end, and sponsor me who will soon meet a beginning of the victor’s life. 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