All times Eastern.

• 6PM, Science Channel - Hot Rocks: The Geology of Civilization: Belief. Host Iain Stewart looks for links between religious beliefs and geology, traveling to Greece to investigate the lost city of Heliki and examining early theories of English surveyor William Smith.
• 6PM, Discovery Health - Critical Incident: Priority One. Observing cases at the R. Adams Shock Trauma Center in Maryland. Included: Medevac teams in helicopters fly in a woman in cardiac arrest caused by multiple gunshot wounds, a man crushed by an SUV and an attempted suicide.
• 6:30PM, 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: Included: electric-guitar amplifiers; marbles; footballs; airplane propellers.
• 7PM, Food Network - Good Eats: Egg Files 5: Souffle-Quantum Foam. Alton Brown takes a scientific approach to making a fluffy cheese soufflé.
• 7PM, Speed - Chop Cut Rebuild: A step-by-step look at vehicle restoration. Several unique vehicles are instructively taken through each phase of the process.
• 7PM, Travel Channel - Vegas Do’s and Don’ts: Cameras examine the lights and action of the strip as experts discuss the secret knowledge that will help make a trip to the Las Vegas the best, including how to see a show for free, the best ways to make money gambling, and how to bet like a pro.
• 7:30PM, Discovery Channel - How It’s Made: Included: engine blocks; jawbreakers; drum shells; drums.

8PM and on after the jump.

• 8PM, PBS - Wild Chronicles: A look at the Genographic Project, which is exploring human-migration patterns via the human gene. Also: sperm whales; how to build a survival shelter; how people influence dogs.
• 8PM, TLC - That’s Gotta Hurt: Improbable Rescues. A motocross jump ends with a crash into a bulldozer; a lobsterman accidentally drives his gaff into his head.
• 8PM, National Geographic - Explorer: Struck by Lightning. The impact of a lightning strike on the human body is examined using revolutionary brain-imaging technology. Also: survivors share their stories.
• 8PM, Military Channel - Weapons Races: The Race for the Ballistic Missile. Chronicling the development of long-range rockets, culminating in nuclear-tipped intercontinental ballistic missiles.
• 9PM, History Channnel - Modern Marvels: Insulation. A history of insulation examines its development, materials and the many ways it is used. Included: how ancient Greek and Roman homes were insulated.
• 9PM, Discovery Channel - MythBusters: Voice Flame Extinguisher. Jamie and Adam try to put out a fire by yelling loudly at it; Kari, Tory and Grant examine four hypnosis hypotheses, including post-hypnotic suggestions and self-hypnosis.
• 9PM, PBS - FAT: What No One is Telling You: An examination of the obesity epidemic. Included: contributing factors; why it’s easier to gain weight than to lose it; the stomach’s independent nervous system; personal stories of overweight people; preventing obesity in children.
• 10PM, Food Network - Good Eats: Pop Culture. Popcorn is examined. Included: a look at its origins; the evolution of the buttery snack. (Yeah, two Good Eats on one day’s listing, what of it? Settle down, pop some corn, grab a beer, and enjoy.)
• 10PM, TLC - Born With Two Heads: An Egyptian child with craniopagus parasiticus, an extremely rare condition resulting in a second head that can smile and blink, undergoes surgery to have it removed.
• 11PM, Food Network - Good Eats: Amber Waves. Home-brewed beer is on tap. Included: the basic principles of yeast, barley and hops. (I know, I know, this is the third one today, but it’s on HOMEBREW!!! How could I not?!)
• 11PM, Comedy Central - Daily show: Halle Berry.
• 11PM, History Channel - Modern Marvels: Fire. Fire and how it is created, used and controlled is the subject.
• 11PM, Discovery Channel - Dirty Jobs: Poo Pot Maker. Mike helps with a survey of the salmon population in a California river and makes gardening pots out of cow pies. Also: Mike checks the mail bag and answers a question about a segment in which he was bitten by a snake.
• 11:30PM, Comedy Central - Colbert Report: Middle East expert Vali Nasr.