How to see the blood vessels in your eyes, and why we have blind spots…
Apr 262011
According to Discovery.com, the SETI Institute has suspended using the Allen Telescope Array, due to budget constraints. The Allen Telescope Array eventually is planned to have 350 telescopes in the array, and was funded by an initial $25 million by Paul Allen (Microsoft’s co-founder).
Bill takes apart a smoke detector and shows how it uses a radioactive source to generate a tiny current which is disrupted when smoke flows through the sensor. He describes how a special transistor called a MOSFET can be used to detect the tiny current changes.
Feb 212011
Professor Phil Moriarty discusses transparent glass and the energy gap. Why does light pass through some glass, and not others…
A Mystery: Why Can’t We Walk Straight? from NPR on Vimeo.
A Mystery: Why Can’t We Walk Straight? from NPR on Vimeo.
Try as you might, you can’t walk in a straight line without a visible guide point, like the Sun or a star. You might think you’re walking straight, but as NPR’s Robert Krulwich reports, a map of your route would reveal you are doomed to walk in circles.
A flight data recorder is a crashworthy device that records data about an aircraft’s flight, such as airspeed, heading, and the procedures of the pilot. It’s also called a black box. Bill Hammack of the University of Illinios opens up a vintage black box from a Delta airlines jetliner.