All times Eastern.

• 6PM, Science Channel – Ultimate Cars: Designers, engineers and journalists pick top cars.
• 6PM, Discovery Health – Code Blue: Fresh Faces. Two new staff members treat a teen who was shot in front of his parents’ home; and his 12-year-old neighbor, who was shot in the neck by police during a search of an abandoned building down the street from a crime scene.
• 6:30PM, Discovery Channel – How It’s Made: Ceramic tiles, nuts, steel forgings, skateboards.
• 6:30, G4 – Ninja Warrior: Human physical ability is tested in each episode, as 100 competitors push their limits through a physically demanding four-stage course.
• 7PM, Discovery Channel – How It’s Made: Featured: lighters; fossils; hockey pucks; high-pressure cylinders.
• 7PM, Food Network – Good Eats: Amber Waves. Home-brewed beer is on tap. Included: the basic principles of yeast, barley and hops.
• 7PM, Military Channel – Wings over Vietnam: Wild Weasels. U.S. pilots in Vietnam develop a defense against Soviet-built SA-2 surface-to-air missiles.

The rest of 7PM and on after the jump.

• 7PM, Discovery Health – Impact: Stories of Survival: Canyon Crash. An accident in a water-skiing competition; a truck crash.
• 7PM, Discovery HD – Paradise for Predators: Sharks of Palau: Cinematographer Jody Helzer leads a team of researchers, divers and photographers to Palau, in the South Pacific, to observe several species of sharks, including reef sharks, hammerheads and zebra sharks.
• 7:30PM, Food Network – Unwrapped: Mini Mouthfuls. A look at the manufacturing of bite-size treats. Included: M&M’s candy; peanut-butter-filled cheese crackers; and doughnut holes.
• 8PM, History Channel – Modern Marvels: Horsepower. A history of horsepower examines the origin of the word and the many ways it’s used. Included: the powerful diesel engine of a container ship; the harnessing of water power at Hoover Dam; the pumping units at the Edmonston Pumping Plant in California
• 8PM, Discovery Channel – Hazard Pay: Ultimate Fighter. Curt trains as an ultimate fighter and steps into the ring.
• 8PM, The Learning Channel – Another 101 Things Removed From the Human Body: More weird stuff taken out of people. Included: 3-D graphics, X-rays, and doctor and patient interviews.
• 8PM, Science Channel – Top Gear: Apache Helicopter vs. Lotus Exige. An Apache helicopter attempts to get a missile lock on a Lotus Exige. Also: BMW 6 series, Jaguar XKR and Porsche 911 Carrera 2.
• 8PM, Speed – Setup: Debut: Amateur racers compete for $100,000 and the chance to qualify for a Grand-Am Series event. The field of 25 is quickly reduced to 10 to start the six-week series. Host: Tommy Kendall.
• 9PM, Discovery Channel – MythBusters: Birds in a Truck. Adam and Jamie investigate the Internet myth that the weight of a truck carrying a load of birds can be lightened if it hits a bump, causing the birds to take flight.
• 9PM, PBS – Nature: Voyage of the Lonely Turtle. F. Murray Abraham narrates this account of a 30-year-old female loggerhead turtle’s journey from Mexico to Japan (its birthplace) to lay eggs. During the yearlong trip (travel speed: 1mph), she passes an array of marine creatures.
• 9PM, Discovery HD – Buried At Sea: A search for some of the millions of tons of chemical weapons and munitions dumped or dropped into the ocean between World War II and the 1970s.
• 10PM, Comedy Central – South Park: New episode!
• 10PM, The Learning Channel – Mystery Diagnosis: Why Is Emily Screaming? Cases include a baby who cries and holds her cheek; and a woman who gained 100 pounds in three months and developed severe acne.
• 10PM, Military Channel – First World War: Breaking the Deadlock. A look at the battle along the Western front, including the tactical approaches of both sides and a series of unofficial truces.
• 10PM, FOXMOV – Revenge of the Nerds (movie): A college outcast leads fellow rejects in a prank war against fraternity jocks.
• 10:30PM, Food Network – Dinner Impossible: Rush Dinner: Frat House. A filthy frat house serves as the venue for a cocktail reception and a five-course meal for 66 distinguished guests.
• 11PM, Comedy Central – Daily Show: Former Iraqi defense minister Ali A. Allawi.
• 11PM, Discovery Channel – Dirty Jobs: Turkey Farmer. Mike tackles turkey and potato farming, and removes sewage from a water-treatment plant.
• 11:30PM, Comedy Central – Colbert Report: Former defense secretary William Cohen.