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Embark on the quest that will occupy the rest of the course: Why is there an arrow of time? Explore how memory and aging orient us in time. Then look at irreversible processes, such as an egg breaking or ice melting. These capture the essence of the one-way direction of time.
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Take to the air for an eye-opening look at aerial robots, from the autopilot features in commercial airplanes to unmanned drones that can deliver packages. Topics include the role of gyroscopic sensors and recent technological advancements that are extending the functionality and power of flying robots like never before.
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According to Newton's third law, for every action there is an equal and opposite reaction. Professor Wolfson has a clearer way of expressing this much-misunderstood phrase. Also, see several demonstrations of action and reaction, and learn about frictional forces through examples such as antilock brakes.
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Visit the African Rift Valley, a mid-ocean ridge in the making. From the Red Sea to Mount Kilimanjaro, tectonic forces are splitting Africa apart, forming a new ocean in the process. This impressive valley is also the site of many fossil discoveries relating to early humans.
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More than three decades after the first cases of Acquired Immunodeficiency Syndrome (AIDS) were reported, the global health community is still dealing with a pandemic of 33 million infected people, of which about 3 million are children. Learn the scientific facts behind this virus and why it is so difficult to find a vaccine or cure.
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Professor Sapolsky introduces you to parasites that exploit their hosts by altering their behavior. After looking at studies, including mites that make ants find food for them and worms that drive crickets to suicide, focus on how rabies and toxoplasmosis can literally change the wiring of the brain in mammals: including humans.
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Pain is a frequent chief complaint in emergency departments. This lecture brings you up close with patients suffering from acute and chronic pain, including the common complaint of back pain. These cases help you better understand everything from pain medications-and the dangers of overuse-to how pain affects the way the brain works.
48) Black Holes, Tides, and Curved Spacetime: Understanding Gravity: Spacetime Tells Matter How to Move
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See how gravity affects Minkowski's spacetime geometry, discovering that motion in a gravitational field follows the straightest path in curved spacetime. The curvature in spacetime is not caused by gravity; it is gravity. This startling idea is the essence of Einstein's general theory of relativity.
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Embark on the final section of the course, which covers the revolutionary theories that superseded classical physics. Why did classical physics need to be replaced? Discover that by the late 19th century, inexplicable cracks were beginning to appear in its explanatory power.
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For the rest of the course, focus on the revolutionary view of gravitation launched by Albert Einstein. Review new ideas about fields that allowed physics to extend beyond Newtonian mechanics. Then see how Einstein modified Newton's laws and created the special theory of relativity.
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This lecture's cases illustrate how sports-related injuries are treated in emergency departments. You'll encounter a softball player suffering from a concussion, a young boy's dangerous eye injury from a haphazard game of lawn darts, a teen rescued from a near-drowning event, and a golfer's stubborn poison ivy rash.
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Study stored electric potential energy in fuels such as gasoline, where the molecular bonds represent an enormous amount of energy ready to be released. Also look at a ubiquitous electronic component called the capacitor, which stores an electric charge, and discover that all electric fields represent stored energy.
53) World's Greatest Geological Wonders: 36 Spectacular Sites: Uluru/Ayers Rock - Sacred Nature of Rocks
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Go to Uluru-Kata Tjuta National Park in Australia to inspect two popular attractions shaped by erosion: Ayres Rock, known locally as Uluru, and the Kata Tjuta rock domes. Trace the history of moving plates, rising and receding seas, and constant weathering that created these impressive structures.
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In this episode, investigate cosmic antigravity, starting with cosmic inflation, a phenomenon that exponentially increased the size of the universe during the big bang. Then, learn why dark matter cannot be made of ordinary protons and neutrons, and explore the recent discovery that the expansion of the universe is accelerating, powered by a mysterious dark energy inherent in space itself.
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Investigate nuclear fission, in which a heavy, unstable nucleus breaks apart; and nuclear fusion, where light nuclei are joined. In both, the released energy is millions of times greater than the energy from chemical reactions and comes from the conversion of nuclear binding energy to kinetic energy.
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The spring sky opens the view into intergalactic space perpendicular to the plane of the Milky Way. Among the objects visible are the immensely rich galaxy clusters in Virgo and Coma Berenices, which are many millions of light-years distant and can be seen with small and moderate telescopes.
57) World's Greatest Geological Wonders: 36 Spectacular Sites: Salar de Uyuni - Flattest Place on Earth
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Travel to the world's largest salt flat, Salar de Uyuni in Bolivia. Almost the size of Connecticut, Uyuni is the flattest place on the planet. When it gets a very thin layer of water, it becomes the world's largest mirror. Uyuni contains the world's largest reserve of lithium: should it be mined?
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Meet several emergency patients who've been bitten by various creatures, from snakes and spiders to ticks and raccoons. Along the way, you'll learn how doctors treat allergic reactions to bites, how they treat wounds without accidentally injecting more venom into the body, and more.
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Not all aspects of musicality mature in the brain at the same rate. Trace the developing music faculty in infants, who have already learned to recognize their mother's speech patterns and singing while in the womb. Examine research showing that singing is more effective than speech in calming infants.
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Advancements in modern robotics have made robots useful, safe, reliable, easy to use, and affordable to have in our homes. So how exactly do different home robots-such as vacuum cleaners like Roomba, gutter cleaners like Looj, and lawn mowers like MowBot-adjust to the unique demands of their respective tasks?
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