Volcanoes are the result of the tectonic movements of the Earth's crust, when magma from the entrails of the planet goes out as lava. They became present in the legends and mythology of all people living around them, which venerated and feared them at the same time. There are submarine and terrestrial volcanoes, but those with an impact in human life are mostly terrestrial, a number of 1,500. These are encountered on the subduction zones (where a tectonic plaque falls under another) like on the Pacific Ring of Fire (from Kamchatka till Indonesia and western Americas, from Alaska to Chile) or on the oceanic mid-ridges (like in Iceland).... [read more >>] Water gives our planet the name "Blue Planet". This chemical gives life to Earth. The Earth's hydrological machine with its vertical cycle, from surface to atmosphere and from atmosphere to the surface, is driven by the Sun energy. 70,000 cubic km of water evaporate yearly from the ground, coming from rivers, lakes and plant and animal transpiration. The seas and oceans contribute with 550,000. The rainfall brings down this water amount: 440,000 on the seas and oceans and 110,000 on the ground, from where a great part is carried by rivers to the oceans and seas, while some amount reaches the water table that fuel the springs. The unde... [read more >>] The emergence of the mountain bikes filled the roads with those addicted to this sport. A mountain bike is very handy for exercising, even if one rides it more often on the roads than mountains. The best bikes for sporting are those with intermediary wheels, which provide an easy movement on the asphalt. Bike riding is a stealth exercise, which covers from a relaxed ride to sophisticated training. As a ride, biking gives a good shape and power for the legs, strengthens the ligaments, articulations and tendons. It helps slimming: a person of 75 kg (190 pounds) will waste 660 kcal/hour at a speed of 25-30 km (15-19 mi)/hour. (trained people c... [read more >>] Volcanoes are the result of the tectonic movements of the Earth's crust, when magma from the entrails of the planet goes out as lava. They became present in the legends and mythology of all people living around them, which venerated and feared them at the same time. There are submarine and terrestrial volcanoes, but those with an impact in human life are mostly terrestrial. These are encountered on the subduction zones (where a tectonic plaque falls under another) like on the Pacific Ring of Fire (from Kamchatka till Indonesia and western Americas, from Alaska to Chile) or on the oceanic mid-ridges (like in Iceland). Amongst the hundre... [read more >>] Before searching for the oldest penis, we must establish when it could have appeared. The penis exists only in those animals that have an internal fecundation, animals which lay eggs or deliver living offspring, but the sperm must fertilize the egg inside the female's body. The lineages that evolved internal fecundation are not many. Some are aquatic: cephalopods (squids, octopuses, cuttlefish), snails (the terrestrial ones, too), crustaceans (only some of them), and sharks. Most are terrestrial, as life on the ground is devoid of water help at the moment of insemination. On land, insects, spiders, snails, reptiles, birds (just few), a... [read more >>] Viruses are entities at the limit of living and non-living. Unlike bacteria, a virus can not feed and reproduce by itself; instead, it needs a host cell to accomplish these functions. That's why they induce diseases; over 50 % of the human diseases and 90 % of the human infections are virus-provoked. A virus is made by a molecule carrying its genetic information (DNA or RNA) and a protein coating (in some cases). They lack crucial elements for an autonomous life, like ribosomes or cell membrane. A virus penetrates inside the targeted host cell, and when it reaches its nucleus, this stops working on its own DNA and starts to produce cop... [read more >>] Spring in the temperate areas is the time when a cycle interrupted by the winter is restarted. Many people are worried by the fact that the extremely warm winters - due to the current man made global warming - could make trees bloom in January or February. But this is not going to happen, as plants and most animals respect an inner calendar. That means that not only light and temperature count, but also the running of a certain time period. During millions of cycles, warmer times could have occurred in many times, but if the plants and animals get back to active life too early, they risk not to stand a sudden frost or other types of bad tim... [read more >>] The character of Sean William Scott in "Road trip" must have been the happiest man in the world. 'Cause he really managed to put to work his G-spot. Actualy, what's this?There are specialists that defend the existence in women on the frontal wall of the vagina of an extremely sensitive point. It was denominated the Gräfenberg spot, or G-spot, after the German gynecologist Ernst Gräfenberg. He said in 1950 that this was a small area that women have, of 0.75 to 3 centimeters in diameter, behind the pubic bone, surrounding the urethra, in the middle of the distance between the superior part of the pubic symphysis and the uterine cerv... [read more >>] Worldwide, each minute, six young people aged 15 to 24 get infected with HIV. Researchers have been studying a way to improve the life quality of the HIV patients the so-called "autovaccine". Researches in this direction have been made in Barcelona (Spain), Laussane (Switzerland) and New York. This method consists in the controlled interruption of the anti-AIDS treatment, so that after various alternations of drug intake and "resting" periods, the patient manages to significantly get down the viral levels, stabilize them and strengthen his/her immune system confronted with the disease. Moreover, during the periods when the drugs are not tak... [read more >>] Rapa Nui or Easter Island, also called by the locals Tepitothenua (the navel of the world) is an almost barren triangular island of 170 square kilometers, believed to be the most isolated inhabited place on Earth, at 3,760 km (2,300 mi) off Chile, to which it belongs, at 27o 08' S and 109o 23' V. It is a volcanic island with two impressive craters: Orongo and Rano Aroi (618 m or 2,060 ft tall) on the sole mountain, Rano Raraku. Due to its magnificent stone statues, 6 to 16 m (20 to 50 ft) tall and weighing 1-20 tonnes, numbering about 800, the island was declared historical monument. The statues, called moai, are the remnants of o... [read more >>] | 
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