In the sixth season premiere, Penn and Teller look at the "War on Porn",a crusade by various special interest groups to restrict free speech and regulate the Internet.

In episode 603, it's time to take a closer look at the National Aeronautics and Space Administration, a government agency that spends scads of taxpayer money to achieve what private industry might be able to do more profitably and efficiently.

In episode 604, the cultural mumbo jumbo regarding dolphins is exposed, including New Age-style beliefs about the animals' evolutionary superiority (bunk, say dolphin experts) and the nonsense about dolphin "energy" believed by many.

In episode 605, the magicians think twice about the high cost of getting a good night's sleep due to the ever-growing industry of sleep product hawkers trying to convince consumers that a special pillow, mist machine or pill will deliver a magical rest.

In episode 606, Penn and Teller consider the popularity of the "green" movement, a largely bogus and hypocritical philosophy that links sanctimonious politics to an "ethical" lifestyle while doing little or nothing to actually create a healthier ecosystem.

In episode 607, the mind control courses known as sensitivity training are dissected and their roots in political correctness, an increasingly litigious culture, and the suffocation of free speech, are finally exposed.

In episode 608, our contrarian hosts argue that the world's never been safer for children, but you'd never know it in our culture of fear, toxic toys and even anti-anxiety medication for kids.

In episode 609, Penn and Teller go on a logic spree with their argument that the utopian ideal of world peace is dangerously naive and out of sync with human nature.

In episode 610, the sixth season finale, the merry myth-shatterers puncture the nostalgic but unrealistic tendency of humans to long for an idyllic past - one that, in truth, never really existed.