Documentary: Educational: Leave It To Beavers. Animal Engineers
Documentary: Educational: Leave It To Beavers. Animal Engineers The fascinating story of beavers in North America - their history, their near extinction, and their current comeback, as a growing number of scientists, conservationists and grass-roots environmentalists have come to regard beavers as overlooked tools when it comes to reversing the disastrous effects of global warming and world-wide water shortages. Once valued for their fur or hunted as pests, these industrious rodents are seen in a new light through the eyes of this novel assembly of beaver enthusiasts and "employers" who reveal the ways in which the presence of beavers can transform and revive landscapes. Using their skills as natural builders and brilliant hydro-engineers, beavers are being recruited to accomplish everything from re-establishing water sources in bone-dry deserts to supporting whole communities of wildlife drawn to the revitalizing aquatic ecosystems their ponds provide.
Beavers are large, semiaquatic rodents in the genus Castor native to the temperate Northern Hemisphere. There are two extant species: the North American beaver (Castor canadensis) and the Eurasian beaver (C. fiber). Beavers are the second-largest living rodents after the capybaras.
Beavers build dams and lodges using tree branches, vegetation, rocks and mud; they chew down trees for building material. Dams impound water and lodges serve as shelters. Their infrastructure creates wetlands used by many other species, and because of their effect on other organisms in the ecosystem, they are considered a keystone species. Adult males and females live in monogamous pairs with their offspring. When they are old enough, the young will help their parents repair dams and lodges and may also help raise newly born offspring. Beavers hold territories and mark them using scent mounds made of mud, debris and castoreum, a liquid substance excreted through the beaver's castor sacs. Beavers can also recognize their kin by their anal gland secretions and are more likely to tolerate them as neighbors.
Historically, beavers have been hunted for their fur, meat and castoreum. Castoreum has been used in medicine, perfume and food flavoring, while beaver pelts have been a major driver of the fur trade.
Documentary Educational: The Sun - Energy Cycles Plasma Sunspots Corona Solar Wind Coronal Mass Ejection - Magnetic fields in the Sun and Sun-like stars are generated by a dynamo, a process involving the rotation of the star as well as convection, the rising and falling of hot gas in the star's interior. Understanding the magnetic dynamo of our Sun is important because it is responsible for a lot of interesting and energetic solar phenomena, some of which can have a considerable impact on our Earth and the wider Solar System. The Sun's magnetic field is responsible for sunspots on its surface, the 22-year magnetic activity cycle (the "Solar cycle"), the Solar wind that pummels planets throughout our Solar System and the ejections of large quantities of plasma – a gas composed of free electrons and free atomic nuclei – known as coronal mass ejections. This ejected material can have a serious impact on Earth, resulting in geomagnetic storms that disrupt radio transmissions, damage satellites and electrical grids, as well as harm astronauts or even people flying in airplanes at high altitudes.
Audio Book: The Memoirs of Sherlock Holmes 10 Adventure of the Naval Treaty - Detective Solve Crime Who done It Mystery Novel Literature - A young diplomat is entrusted with copying a top-secret naval treaty, but when he returns to his office, the treaty is gone. Sherlock Holmes is called in to investigate, and he must use his deductive skills to track down the thief and prevent a national security crisis.
Audio Book: Return of Sherlock Holmes - 10 Adventure of the Golden Pinez-Nez
When a young man is found murdered in the study of his elderly employer, Sherlock Holmes must use all of his powers of deduction to track down the killer.
Audio Book: Solar Warden - Alien Hostiles 1/2 - Science Fiction... Or Is It?
By exposing the sinister Saurians, Navy SEAL Lieutenant Commander Mark Hunter and his team have more than proven themselves. Yet the war between humanity and the intergalactic aliens has only begun—now they must save themselves and all of civilization.
The JSST—the Joint Space Strike Team Hunter has put together from all branches of the U.S. military—is again deployed on board the Earth starcraft carrier Hillenkoetter on a mission to probe a possible historical connection between the Saurians and the Nazi Third Reich. At a planet called Paradies orbiting the red giant star Aldebaran, they discover a long-rumored colony of expatriate Nazis... and the beginnings of a plan to enslave Earth under Nazi—and Saurian—rule.
With Earth at stake, governments deeply compromised, and evil at the door, Solar Warden must fight together to end it all…even if it means sacrificing everything.
Audio Book: The Memoirs of Sherlock Holmes 4 Adventure of the Gloria Scott - Detective Solve Crime Who done It Mystery Novel Literature - Sherlock Holmes and Dr. Watson investigate the mysterious death of a young man.
Audio Book: Pellucidar by Edgar Rice Burroughs - Science Fiction - Earth is a hollow shell with Pellucidar as the internal surface of its shell. Pellucidar is accessible to the surface world via a polar tunnel, allowing passage between both the inner and outer worlds through which a rigid airship visits in the fourth book of the series. Although the inner surface of the Earth has a smaller total area than the outer, Pellucidar actually has a greater land area, as its continents mirror the surface world's oceans and its oceans mirror the surface world's continents.
Pellucidar is lit by a miniature sun suspended at the center of the hollow sphere, so it is perpetually overhead and gives a sensation of eternal noon wherever one is in Pellucidar. The sole exception is a region directly under a tiny geostationary moon of the internal sun. As a result, this region is under a perpetual eclipse and is known as the "Land of Awful Shadow". The moon has its own plant life and (presumably) animal life, and either has its own atmosphere or is simply suspended within Pellucidar's. The miniature sun does not change in brightness and never sets. As a result, with no night or seasonal progression, the natives have little concept of time. The events of the series suggest that time is elastic, passing at different rates in different areas of Pellucidar and varying even in single locations. Also, several characters living in Pellucidar who are originally from the outer world appear to age slowly and exhibit considerable longevity. This is known through their interactions with visitors from the outer world, where time passes at a fixed rate.
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Audio Book: The Memoirs of Sherlock Holmes 2 Adventure of the Yellow Face - Detective Solve Crime Who done It Mystery Novel Literature - A man seeks Sherlock Holmes's help when his wife starts acting strangely.