Google Tech Talk August 13, 2010 ABSTRACT Presented by Sean Carroll. One of the most obvious facts about the universe is that the past is different from the future. We can remember yesterday, but not tomorrow; we can turn an egg into an omelet, but can't turn an omelet into an egg. That's the arrow of time, which is consistent throughout the observable universe. The arrow can be explained by assuming that the very early universe was extremely orderly, and disorder has been increasing ever since. But why did the universe start out so orderly? I will talk about the nature of time, the origin of entropy, and how what happened before the Big Bang may be responsible for the arrow of time we observe today. Speaker Info: Sean Carroll I'm a theoretical physicist at Caltech in sunny Pasadena, California. My research interests include theoretical aspects of cosmology, field theory, and gravitation. I want to learn about fundamental physics by studying the structure and evolution of the universe. These days I'm especially interested in inflation, the arrow of time, and what happened at or before the Big Bang. I've done a bunch of work on dark matter and dark energy, modified gravity, topological defects, extra dimensions, and violations of fundamental symmetries. I recently finished writing a popular-level book on cosmology and the arrow of time: From Eternity to Here: The Quest for the Ultimate Theory of Time, which I expect all of you to buy. I previously wrote a graduate textbook ...
Friday, November 25, 2011
Wednesday, November 16, 2011
Miele S5 Callisto vs. Kenmore Progressive Canister Vacuums
In continuation of the GoVacuum video series, we have created a video review of two vacuum cleaners. We put to the test the Miele Callisto S5280 and the Kenmore Canister Vacuum. Our decision to put these two vacuums head to head stems from the Consumer Reports magazine. For years, the Consumer Reports magazine has rated the Kenmore Canister number one. The Miele has been ranked at 5 or 6. Having many, many years of industry experience, the Consumer Reports ranking has left us baffled because the Miele Callisto is one of our best canisters because of its high quality, unbeatable performance and long life. In order to compare the vacuums, we are performing three tests with the machines. First, the machines' filtration systems are being tested with the use of a laser particle scanner which calculates the number of particles being emitted from the exhaust filter on the canisters. Second, the machines are tested on their ability to side clean, meaning how well the machines' power heads can clean when against a wall or any other surface. Lastly, the machines are tested on their maneuverability. One of the things that people complain most about when considering canisters is how difficult they are to maneuver, especially when you have the feeling that you are dragging a dead weight behind you. All in all, the Miele Callisto definitely came out on top as the winner. But you will have to check out the video to see the results yourself. If you are looking to purchase a machine, or ...
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