All times Eastern.

• 6PM, Discovery Channel - How It’s Made: Cement; caskets; soft drinks; glider rockers.
• 6PM, History Channel - Modern Marvels: Ball Turret Gunners. The work of ball-turret gunners in World War II is examined.
• 6PM, Discovery Health - Code Blue: Out of the Darkness. Segments include a robbery victim who was shot; an auto accident involving a pickup truck and an 18-wheeler; a woman who fell down a flight of stairs; and a man with a collapsed lung.
• 6PM, Discovery HD - I Shouldn’t Be Alive: Dive Into Danger. Two divers on a tropical dive encounter bad weather that sets them adrift at sea, battling exhaustion, dehydration and sharks.
• 6:30PM, Discovery Channel - How It’s Made: Three-wheeled vehicles; baseball bats; artificial bonsais; trombones.
• 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, Food Network - Good Eats: Chile’s Angles. Adding flavor and heat to food with chiles. Prepared: salsa; spicy pineapple sauce.

The rest of 7PM and on after the jump!

• 7PM, Speed - Chop Cut Rebuild: Moving Along. Paint and pinstripes for the hot rod; body modifications for the race car.
• 7PM, Discovery HD - Dinosaur Planet: Alpha’s Egg. A female Saltasaur, a large herbivorous dinosaur of South America, is observed from birth to adulthood, as she navigates through a strange and dangerous world.
• 7PM, Discovery Health - Impact: Stories of Survival: A Jump Too Far. A top motocross jumper performs a spectacular jump near Santa Barbara while being filmed from a helicopter, but overshoots the landing and crashes at 70 mph.
• 8PM, Discovery Channel - Oil, Sweat and Rigs: Oklahoma. Two teams of riggers search for oil in Oklahoma in a race to win a multimillion dollar contract, but they only have two weeks.
• 8PM, LWOR - International Fight League’s Total Impact: Renzo Gracie’s Pitbulls face Matt Lindland’s Wolfpack, the 2006 World Championship finalists.
• 8PM, PBS - Nature: Raptor Force. Raptors such as the peregrine falcon, golden eagle and red-tailed hawk are spotlighted. Included: a miniature camera captures the world as birds see it; and chronicles a golden eagle’s pursuit of a jackrabbit.
• 8PM, Discovery HD - Risk Takers: Blasters. Profiling an explosives demolition expert.
• 8PM, Science Channel - The Planets: Moon. Examining the possibility of establishing bases on the moon to exploit resources that may be available.
• 8:30PM, Fuel - Weekly Update: A look at the world of action sports, including news, highlights and interviews with athletes.
• 9PM, HBO - Entourage: Return of the King. Vince is energized by the availability of the “Medellin” role, but Ari’s religious obligations keep him from helping to close the deal with the producer; Eric suspects Amanda’s not working hard enough for her client.
• 9PM, History Channel - Cities of the Underworld: Rome’s Hidden Empire. Rome’s underground is explored. Included: Domitian’s stadium beneath the Piazza Navona; and remains of the Basilica Ulpia under the Fendi art gallery.
• 9PM, Travel Channel - Bizarre Foods with Andrew Zimmern: Spain. Host and Chef Andrew Zimmern travels to Spain where he visits restaurants and a ham museum in Madrid and a food market in Barcelona all while tasting some of the country’s strangest foods like baby eels, crickets, bull’s tail and pig ears.
• 9PM, NBC - Heroes: The Hard Part. Hiro and Ando are even more determined to save the world after seeing the grim future; Nathan takes steps to win the election; Thompson (Eric Roberts) brings someone new into the organization; and Sylar visits his mom (Ellen Greene).
• 10PM, Discovery HD - Stunt Junkies: Go Big or Go Home: Snowboard World Record. Alexis Waite attempts to set a snowboard world record for the longest distance jumped by being towed by a snowmobile down a slope to a takeoff ramp.
• 10PM, Travel Channel - Anthony Bourdain: No Reservations: Uzbekistan. Discover Uzbekistan’s culture with a tour of 2000-year-old capital, Tashkent, including food, nightlife, religion and shopping.
• 10PM, Military Channel - Weaponology: Artillery. Battlefield artillery is examined, from catapults to cannons. Also: developments in gunpowder and the evolution of superguns.
• 10PM, FX - The Riches: Cinderella. The Malloys must throw the perfect dinner party if Wayne is to have a future at Panco; Dahlia unexpectedly meets her former cellmate.
• 10PM, National Geographic - Is It Real?: King Arthur. Scholars examine the legend of King Arthur to determine whether he was a real king or simply a mythical figure. Included: a visit to what some believe is his birthplace.
• 11PM, Comedy Central - Daily Show: Christopher Lee Gutkind, author of Almost Human
• 11PM, HGTV - World’s Most Extreme Homes: An underground home in Canada; a tree house made from reclaimed Japanese miso containers; a colorful home in Peru with glass walls and oddly shaped windows.
• 11PM, Discovery Channel - MythBusters: Helium Football. Examining the myth that a football filled with helium will fly further and hang longer than one with regulation air. Also: catching a bullet with one’s teeth.
• 11:30PM, Comedy Central - Colbert Report: Richard Preston, author of The Wild Trees