THE AMBITIOUS DAWN MISSION, launched in September 2007, is one of NASA’s most remarkable ventures into the solar system. The spacecraft has recently completed a spectacular exploration of Vesta and is now traveling to Ceres; these were among the last uncharted worlds in the inner solar system prior to Dawn. It is the only spacecraft ever to orbit an object in the asteroid belt. Such a mission would be impossible without the use of ion propulsion, a technology that has mostly been in the domain of science fiction, but which was tested extensively on the Deep Space 1 mission, paving the way for Dawn. In this lecture, Dr. Marc Rayman, Dawn’s Chief Engineer and Mission Director at JPL, describes the Dawn mission and its use of ion propulsion as well as its two exotic destinations. He also shares the excitement and profundity of controlling a spacecraft in deep space.
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Science Based Medicine vs. Alternative Medicine
Understanding the difference could save your life! In this superb 10-part video lecture series, Harriet Hall, M.D., contrasts science-based medicine with so-called “complementary and alternative” methods. The lectures each range from 32 to 45 minutes.
The Top Ten Strangest Beliefs
Michael Shermer has compiled a list of the top 10 strangest beliefs that he has encountered in his quarter century as a professional skeptic.
Who believes them? Why? How can you tell if they’re true?
What is a conspiracy theory, why do people believe in them, and why do they tend to proliferate? Why does belief in one conspiracy correlate to belief in others? What are the triggers of belief, and how does group identity factor into it? How can one tell the difference between a true conspiracy and a false one?
The Science Behind Why People See Ghosts
Do you know someone who has had a mind altering experience? If so, you know how compelling they can be. They are one of the foundations of widespread belief in the paranormal. But as skeptics are well aware, accepting them as reality can be dangerous…
Top 10 Myths About Evolution (and how we know it really happened)
If humans came from apes, why aren’t apes evolving into humans? Find out in this pamphlet!
Learn to do Psychic “Cold Reading” in 10
Psychic readings and fortunetelling are an ancient art — a combination of acting and psychological manipulation.