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25 Worlds Weirdest Animals موضوع: مطالب علمی Science یکشنبه پانزدهم اردیبهشت 1387 25 Worlds Weirdest Animals Axolotl
The Axolotl (or ajolote) (Ambystoma mexicanum) is the best-known of the Mexican neotenic mole salamanders belonging to the Tiger Salamander complex. Larvae of this species fail to undergo metamorphosis, so the adults remain aquatic and gilled. The species originates from the lake underlying Mexico City. Axolotls are used extensively in scientific research due to their ability to regenerate most body parts, ease of breeding, and large embryos. They are commonly kept as pets in the United States, Great Britain, Australia, Japan (where they are sold under the name Wooper Rooper, and other countries. Axolotls should not be confused with waterdogs, the larval stage of the closely related Tiger Salamanders (Ambystoma tigrinum and Ambystoma mavortium), which is widespread in much of North America which also occasionally become neotenic, nor with mudpuppies (Necturus spp.), fully aquatic salamanders which are unrelated to the axolotl but which bear a superficial resemblance. Aye-aye
The Aye-aye (Daubentonia madagascariensis) is a strepsirrhine native to Madagascar that combines rodent-like teeth with a long, thin middle finger to fill the same ecological niche as a woodpecker. It is the world's largest nocturnal primate, and is characterized by its unique method of finding food; it taps on trees to find grubs, then gnaws holes in the wood and inserts its elongated middle finger to pull the grubs out. Daubentonia is the only genus in the family Daubentoniidae and infraorder Chiromyiformes. The Aye-aye is the only extant member of the genus (although it is currently an endangered species); a second species (Daubentonia robusta) was exterminated over the last few centuries. ادامه مطلب نوشته شده توسط سعید | لينک ثابت |
Science and Spirituality موضوع: مطالب علمی Science چهارشنبه بیست و چهارم بهمن 1386 Science and Spirituality Spirituality and Science is seen by many as two separate things. What we normally call Science is that which we can measure, see and prove. From that perspective, Spirit is maybe the last thing to find in any microscope. The science of Spirituality is maybe not so easily measured from the parameters used in normal science. I recommend this article: Spirituality and Science - 1, and also this: Spirituality and Science - 2. نوشته شده توسط سعید | لينک ثابت |
The most important inventions and discoveries of the humanity... موضوع: مطالب علمی Science یکشنبه یازدهم آذر 1386 The most important inventions and discoveries of the humanity...An American Science Community has concluded after one of its researches that Mendeleev's periodic table of elements was the most important discovery the humanity made... even more important than the discovery of iron. The Community has published a list of 10 most important discoveries the humanity ever made. The results of this research were based on answers of a survey conducted by the community. According to that survey: ادامه مطلب نوشته شده توسط سعید | لينک ثابت |
Ancestors of humans learned to walk in trees موضوع: مطالب علمی Science شنبه سی ام تیر 1386 Ancestors of humans learned to walk in trees Scientists from the "As the forests became sparse, the strategy of our human ancestors was more or less to abandon the canopies and come down to the ground," said one scientist. Museums and schools across the world have been teaching that humans evolved from an animal much like that of a chimpanzee and that humans started to walk along the forest floors, with their arms hanging, and knuckles scraping across the ground. It is also taught that those animals then began to walk upright once they adapted to living on the ground. Orangutans were observed by a researcher for one year. She documented that the orangutans would generally walk on their hands and feet, but when food was at a height that they could not reach, the orangutans would stand on their feet, extend upright, and grab the fruit or food item they want. "When they move to the skinniest branches, where the tastiest fruit grows, they stand stiffly straight-legged, like a person," she added. The researchers also compared evidence from the remains of Lucy, past climate conditions on the planet and fossils to the workings of orangutans, and all suggest that humans were living and swinging in the trees for a much longer period of time than previously thought. The study shows that humans may have learned to walk at least 24 million years ago, rather than 6 million years ago. Some experts disagree with the study. "The main evidence is that our closest living relatives are not orangutans, they're chimps and gorillas, and since both climb trees and walk on their knuckles, it's most likely our ancestors did that too. One of the only anatomical features we share explicitly with chimps and gorillas is that we only have eight wrist bones, while almost all other primates have nine," said anthropologist at George Washington University, Brian Richmond. Story Source: Wikinews English Vocabulary Notes sparse = less dense canopy = the leaves and branches of trees, that make a kind of roof in a forest: the forest canopy نوشته شده توسط سعید | لينک ثابت |
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