Monday, June 9, 2008

The Different Types of Turtles

There are hundreds of different types of turtles. This article aims to give you a brief overview of the different types of turtles. Here is a short list of some of the types of turtle:

The Pig Nosed Turtle: This type has been called the Australasian Pig-nose turtle, the pitted shelled turtle, the plateless turtle and even the fly river turtle. This kind is soft shelled and is usually found in freshwater rivers, lagoons and streams in Australia's Northern Territory and in New Guinea.

The Green Sea Turtle: This family of turtle is rather large and can be found in most subtropical and tropical areas in the world. It has two very distinct populations in the Pacific Ocean and the Atlantic Ocean. This is an endangered species and it is illegal to harm, kill or collect them.

The Alligator Snapping Turtle: This is the biggest freshwater turtle on the continent of North America. It is larger than but not quite as aggressive as the common snapping turtle. These turtles are often found in the Missouri River and in South Carolina and the northern areas of Florida. This kind of turtle can stay under water for almost an hour.

The Mesoamerican River Turtle: sometimes this type of turtle is called the hickatee or the tortuga-blaca. This turtle is nocturnal and lives in the lakes and rivers of Central America. Like many other species of turtles, this species is endangered. These turtles can get as big as twenty five inches and can weigh up to forty four pounds.

The Leatherback Turtle: Of all of the types of turtle, this turtle is the largest of them all. The leatherback is a sea turtle and is the only species of turtle that does not have a hard shell. Instead it only has flesh and skin. This kind can be found all over the world.

The Red Eared Slider Turtle: This is known as a semi-aquatic turtle and is usually found in the southern area of the United States, particularly in the Mississippi River. Of course, because it makes a very popular pet, it can be found in pet stores all over the world.

The Common Musk Turtle: This type has also been called The Stinkpot. It got its name because it is able to release a musky and foul odor to dissuade any predators that might think of hunting it. These turtles are found in the Eastern United States and Southeastern Canada.

The Big Headed Turtle: This is one of the types of turtles that is usually found in Vietnam, Thailand, Myanmar, Laos and China. It's head is extremely large and it has been known to climb the trees that are near the rivers and streams where it lives It has also been known to arc its tail (like a scorpion) and is one of the different types of turtles that is unable to pull its head into its shell.

Copyright (c) 2008 Steven Magill

For great turtle care advice, turtle food recommendation or turtle health issues visit us at...http://www.petturtlecare.net/

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Fascinating Properties of the Golden Ratio

The golden ratio, also known as the golden mean, is a number with some truly amazing properties. This number is equal to 1 plus the square root of 5, all divided by 2. Rounded to 10 decimal places, it is equal to 1.6180339887. The golden ratio has fascinated people throughout history, and as a result, it appears in numerous works of art and architecture. In addition, the ratio occurs in nature as well as in geometry and in connection with the Fibonacci sequence.

The most basic property of the golden ratio is that it is the only positive number which is equal to one more than its reciprocal. It is also equal to one less than its square. The continued fraction coefficients of the golden mean are all equal to 1. Consecutive powers of the golden ratio converge to the Lucas sequence: 1, 3, 4, 7, 11, 18, ..., a sequence closely related to the more well-known Fibonacci sequence: 1, 1, 2, 3, 5, 8, ... . To obtain the next number in either of these sequences, one adds the two previous numbers. The golden ratio is the limit of the ratio of consecutive Fibonacci or Lucas numbers as these numbers get large.

One of the most fascinating constructions involving the golden mean is the golden rectangle, a rectangle whose proportions are equal to this ratio. A golden rectangle may be subdivided into a square and a similar golden rectangle. In fact, this pattern may be continued forever. By connecting the vertices of the resulting rectangles, one obtains a logarithmic spiral, a shape found in nature.

Another geometric construction exhibiting the golden ratio is the pentagram, or five-pointed star. The pentagram contains line segments of four different lengths. The ratio of the lengths of any consecutive pair of such line segments is equal to the golden ratio.

The golden ratio appears in plenty of buildings throughout the ages, including the Great Pyramids of Egypt, the Parthenon, and the United Nations building. It also appears in several works of art. Leonardo da Vinci and Salvador Dali used the golden ratio in some of their artworks.

The golden ratio and Fibonacci numbers also occur in nature. In particular, the seeds and flowers of many plants exhibit structures utilizing the golden ratio. For instance, many sunflowers have spiral patterns of petals with 89 spirals going one way and 55 going the other way. These are both Fibonacci numbers and their ratio is a very good approximation to the golden ratio.

http://www.mathamazement.com

http://mathamazement.com/Lessons/Everyday-Math/05_Miscellaneous/05_03_Important-Numbers/golden-ratio.html

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Herp Hunting in the Northern Territory, Australia

Appeared in 'Reptile Care' Volume 3, Issue 3

The northern territory is well known for being the real bush. It has a population of less than 200000 people, over 90% of which live in Government areas. These government areas only cover 5% of the Northern Territory, which leaves over 1.2 million square kilometres virtually deserted. This area is nearly five times the size of the UK! As you can now imagine, this is an incredibly large and diverse landscape! There are approximately 300 species of reptile, and 50 species of amphibian in the Northern Territory. Slightly more diverse one might say, than the UKs species count of only 6 reptiles and 6 amphibians!

I spent the entire year of 2005 travelling around Australia. I went to every State, every major city, drove across the longest straight road in the world, twice, and travelled the complete circumference of this beautiful country. But the Northern Territory was in my books, by far the most fantastic place I have ever been. I spent 3 months in Darwin, and several more weeks travelling around the NT, going as far south as Alice Springs and Ayers Rock (Uluru in Aboriginal terms). I knew the place was for me when, only a few days after I drove through, I saw my first wild Black Headed Python (Aspidites melanocephalus) crossing the road. What a shock! This was the first snake I had seen in Australia and I had already driven thousands of kilometres. I nearly ran it over, but swerved suddenly, missing it by millimetres! I turned around and went back, moving it off the road before the 50 metre oncoming road train ploughed straight through us all! It was a beautiful, 2 metre female in perfect condition. It was different seeing such an animal in the wild, after seeing many of them in friends collections, it did not compare to the wonderful feeling of seeing her out in the bush and lending her a helping hand getting across the road. This was definitely for me! I knew there was plenty more where she came from, and I would definitely find them!

During my time in the Northern Territory, I spent 3 months working at Crocodylus Park. A crocodile research and education centre, home to approximately 8000 saltwater crocodiles and a number of other crocodilian and animal species. This was certainly an experience of a lifetime. Not only to work with such a large number of large crocodiles, but also to meet a whole group of brilliant ozzies! Myself and my girlfriend Eirlys stayed with an Australian couple; Cade & Holly. Cade knew the area and had been working at the park for a couple of years. He told me of a place he goes to on a regular occasion. He said to me; We drive out after the sun sets, about 45 minutes out of town and just cruise for snakes. Well, that just sounded too easy for me, but I definitely wanted to give it a go!

Only a few days later, Cade had organised a few of his mates to join us on a night out herping. We set off in convoy, Cade and 3 others in his car, closely followed by Maddys car with me in the back and another couple of people! 45 Minutes later and we arrive at Fogg Dam. This place wasnt what I expected, it didnt look so amazing. We started driving very slowly along this road, which soon turned quite narrow, with a 2 metre drop off either side into dense, wet marshland. This was however, the dry season. In the wet season this road is not even visible, being completely submerged in water. Only a few seconds after driving along, comes our first catch of the night; a Yellow-Bellied Water Python (Liasis mackloti)! This was very closely followed by another, then another, then another. Within half an hour we had picked 14 water pythons off the road, even catching 2 or 3 at a time! Of course, all of these were released straight back into the marshes. I certainly had second thoughts about this place, it was amazing!

After our successful water python round-up, we took the time to sit by the road and see what we could spot. Out came our big torches, shining into the marsh either side of the road. The eyes of at least 20 crocodiles shone back at us. Most were the freshwater crocodiles (Crocodylus johnstoni), but some eyes were larger and further apart, these were the bigger, saltwater or estuarine crocodiles (Crocodylus porosus). I had seen this on TV many times, but it was quite different to see this naturally. I must admit, even working with crocodiles all day; knowing that we were surrounded by hundreds of them was certainly a scary thought! The night was topped off by a find I was desperate for, a Northern Death Adder (Acanthophis praelongus)! An absolutely beautiful one too, camouflaged so well into the road we nearly turned it into another piece of road-kill. This was a successful night!

I later found out, Fogg Dam has the largest concentration of predatory animals in the world! The water pythons on their own, represent the largest density of predatory species in such a concentrated area. Their prey is the dusky rat, which are said to be in numbers of 15000 per square kilometre. From these numbers of prey, it is easy to understand their success.

Darwin is a small capital city, with just over 100000 people, over half the population of the entire Northern Territory. You only have to drive an hour out of the city centre to reach Litchfield National Park; a 1500 square kilometre oasis of Northern Territory habitat, including one of the most famous termite mound spectacles in the world, a number of amazing water falls, rock formations and forested areas. A couple of hours due East is the even larger Kakadu National Park, covering nearly 20000 square kilometres of land, nearly the same size as Ireland! This is one of the most famous National Parks in the world and it certainly should be. Home to thousands of species of flora & fauna.

It was nice to get out to Litchfield National Park on weekends, being only a short drive away. I went several times during my stay in the NT. It has an abundance of wildlife visible during the day, but at night it really comes alive! Litchfield is famous for its Magnetic Termite Mounds, so called because they are all north south facing. The structures are approximately 3metres tall and built so that the narrowest edge is facing the extremely intense sun for the midday heat. With so many termites, come so many predators. Many species of skinks and other small lizards are common here. The Northern Territory is home to approximately 100 species of skink, many rely on small insects such as termites. With so many small lizards, come many reptiles that feed upon these lizards, including the Burtons Legless Lizard (Lialis burtonis). This is one of the larger species of legless lizard, and has the unusual, snake-like characteristic of being able to un-hinge its jaw to allow an easy passage for their larger food items. These are very common in Litchfield, and I was fortunate enough to see many. All of which varied in colour.

Orange-naped snakes (Furina ornata) are plentiful in the Northern Territory, although they are not seen nearly as often as other species. I was lucky enough to spot this guy slithering across the road one night. My tour guide for the night was Maddy, one of Cades mates. He had been herping for years around the Territory, and was familiar with the different species of reptiles you might find on the different nights, at certain times of the year. He thought I must be a good luck charm, as this was the first Orange Naped Snake he had ever caught here!

I have dealt with hundreds of species of snake in the last few years, but I really wanted to get a taste for the lethal stuff. The Northern Territory was certainly the place to do it; and at this point I had already encountered a Death Adder in the wild. That though, wasnt enough. The Coastal Taipan (Oxyuranus scutellatus) was a rare sight and although I hoped to catch a glimpse of one, the opportunity never came. I was more fortunate however with the Brown Snakes! I saw 2 Western Brown snakes (Pseudonaja nuchalis) within a few kilometres of each other in Litchfield National Park. Unfortunately though, my one and only sight of a wild King Brown (Pseudonaja australis), was a juvenile victim of a car tyre. It had only just happened, we had passed the same spot just half an hour earlier, yet on our way back through, the snake had appeared, dead.

A number of reptile and insect species can be found in and around the Darwin area. While living in Karama, we had a number of visitors to our backyard. Green Tree Snakes (Dendralaphis punctulatus), Two-Lined Dragons (Diporiphora bilineata), Striped Tree Dragons (Amphibolorus temporalis), Australian House Geckos (Gehyra australis), Asian House Geckos (Hemidactylus frenatus), Garden Skinks (Carlia gracilis and Carlia munda)and Mertens Water Monitors (Varanus mertensi). Huntsman and Redback spiders are also common in households and gardens.

By Chris Jones
Director of Pet Club UK Ltd.
http://www.petclubuk.com

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Science Fair Projects - Time to Face the Judges

It is that time of the year - science fair project judging time. All the little hearts are a-twitter. This is what you have worked and toiled for. A chance to win an award for your hard work, ingenuity and creativity. It is very important that the student knows something about the judging process. For after all, if you do not know what the judges are looking for how can you make a presentation to win their approval?

No two judges or judging groups are exactly the same. Therefore we are going to outline the latest ideas and secrets that the judges use to make determinations as to the excellence of the many different projects.

On judgment day, dress nicely. Have a neat appearance. Clean clothes. Try your best to appear confident and show that you are happy to be there. If you act scared or lack confidence, this will set the wrong attitude. Be confident. Be cheerful. Show that you are pleased to have the opportunity to share your work with others. Be forthright. Do not speak too rapidly. Look the judges in their eyes when you speak to them. Stand straight, do not slouch or lean on your elbows. Do not put your hands in your pockets. Say good morning or good afternoon to the judges. Tell them you are pleased to be here and will be delighted to answer any questions.

The judges will use a point system. With so many projects to judge, they will have to give each project a score, so that when all the presentations have concluded they can tell who came in first, second and so forth. The judges will care about originality. Were you ideas properly thought out? Are you clear about describing the problem and your hypothesis?

You want to be certain that you know your material, especially the results of your final report. The relative easiness or difficulty of your project is important. The lower grades will not be expected to do difficult projects. The judges will be more interested in procedures than in difficulty. The upper grades will be expected to deal with more difficult subject matter. Judges will be interested in seeing how knowledgeable you are about your experiment. You must show them that you fully understand the project details, and truly understand your experiment.

You must show the judges that you used the scientific method and that you recorded all data properly. You should repeat your experiments to prove that your methods are reproducible. Be certain to use neat and graphic tables and charts to display your data. You must be prepared to answer the judges' questions with confidence. Make certain that you refer to your display when answering questions.

Judging is mostly subjective. The way that you handle yourself and the way that your display looks can make a big difference in the mind of the judge.

Here is a list of sample questions asked by judges at previous science fairs:

- How did you come up with the idea for this project?

- What did you learn from your background search?

- How long did it take you to build the apparatus?

- How did you build the apparatus?

- How much time (many days) did it take to run the experiments (grow the plants) (collect each data point)?

- How many times did you run the experiment with each configuration?

- How many experiment runs are represented by each data point on the chart?

- Did you take all data (run the experiment) under the same conditions, e.g., at the same temperature (time of day) (lighting conditions)?

- How does your apparatus (equipment) (instrument) work?

- What do you mean by (terminology or jargon used by the student)?

- Do you think there is an application in industry for this knowledge (technique)?

- Were there any books that helped you do your analysis (build your apparatus)?

- When did you start this project? or, How much of the work did you do this year?

- What is the next experiment to do in continuing this study?

- Are there any areas that we not have covered which you feel are important?

There are a number of things to remember when speaking with the judges. Most importantly, be yourself and be proud of the time and work you've put into your project. Here is a checklist of things to remember:

Demonstrate originality in your project and display

- State the problem clearly

- Ensure your data justifies the conclusion

- Make sure your project is carefully planned

- Make sure your data is accurate

- Ensure your data documents your work

- Make sure the display is complete and top quality

- Do all your own work

- Ensure all reports, displays and project materials are neat

- Be excited and energetic about your project and findings

- Speak slowly and look the judges in the eye

- Present your project and results confidently

There you have it. The most important aspects of judging science fair projects. Nothing is more important than making sure that you have a good time and show the judges that you are enthused about what you did and happy to have the opportunity to share your work with them. Do not lie if they ask questions that you cannot answer. Be forthright and honest. Thank them for taking the time to judge your project. And remember, even if you do not win a prize, the exercise of doing science fair projects is all about learning and experience. The prize is secondary. If you really put out an effort to do a good project, the real prize is within yourself. Do you feel that you did a good job and learned something in completing your science fair project? If so, you have already come out a winner!

Mort Barish is co-founder of Terimore Institute, Inc. providing science fair projects for children in grades K-12 to help them successfully compete in science fairs. He has been creating educational materials for children and related graphic communications for almost fifty years. He is the author of seven books and has won numerous awards for his graphic presentations.

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