All times Eastern.

• 6PM, Discovery Channel – How It’s Made: Included: guitars; carpets; drinking water; laser eye surgery.
• 6PM, ESPN2 – Gearz: Instruction on customizing and building cars, trucks, hot rods and other rides. Also: test drives.
• 6PM, History Channel – Engineering an Empire: The Persians. The engineering achievements of the Persian Empire are explored. Included: the Mausoleum of Maussollos, one of the Seven Wonders of the World; a water-management system; a cross-continental paved roadway.
• 6PM, Science Channel – Driven to Invent: Duel in the Darkness. The invention of radar and its use in civilian and military applications. Included: inside a Royal Air Force base to observe how a new radar system operates.
• 6PM, Travel Channel – Top Ten Monster Trucks: The top 10 giant trucks in the United States are counted down, including trucks that are used for times of natural disaster, rescue those in grave danger, and carry heavy loads; cameras show trucks’ prowess while doing their jobs.

6:30 and on after the jump!

• 6:30PM, Discovery Channel – How It’s Made: Temporary Metal Fences, Asphalt Shingles, Expanded Polystyrene Products, Hard Candies
• 6:30PM, HGTV – Rezoned: A cheese storage building; a 1938 freight house; a century-old bank; a 1907 water plant.
• 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: Let Them Eat Foam (Angel-Food Cake). Baking angel-food cake. Also: shopping for cake pans.
• 7PM, Discovery HD – Viking Voyages: Examining the journeys of Leif Ericson and how he hopscotched from Iceland to Greeenland to Newfoundland almost 500 years before Columbus. Included: the site of the first European settlement in the New World.
• 7PM, History Channel – Modern Marvels: Nature’s Engineering 2. The intricate engineering feats of nature’s creatures, including ogre-faced spiders, Egyptian vultures, prairie dogs and aphid-tending ants.
• 7PM, Speed – Chop Cut Rebuild: Parts Start to Fly. The ‘56 Chevy chassis returns from fabricating; host Dan Woods has a run-in with the police.
• 7PM, VH1 – Classic Albums: Stevie Wonder: Songs in the Key of Life. Examining the making of Stevie Wonder’s 1976 release “Songs in the Key of Life.”
• 8PM, PBS – Wild Chronicles: Congo’s Nouabalé Ndoki National Park; bluefin tuna; saving Panama’s golden frog from a deadly fungus. Also: orcas’ feeding habits and their possible connection to a decline in the whales’ population along the Washington coast.
• 8PM, Discovery Channel – Hazard Pay: Killer Bee Removal. Curt works as a killer-bee remover.
• 8PM, Science Channel – Top Gear: The Indestructible Toyota Truck (This is such a great show. If you’ve never watched it, you really should.)
• 8PM, National Geographic – Explorer: Inside North Korea. Lisa Ling goes undercover to cross the heavily militarized border of North Korea to get a rare glimpse at life in one of the world’s most secretive countries. Included: a defector details his escape.
• 9PM, Discovery Channel – MythBusters: Walking on Water. Adam and Jamie probe myths about ninjas and martial arts.
• 9PM, TLC – Brookhaven Spectrum: Nuclear research and engineering are examined in this 1971 film.
• 9PM, Discovery Times – Most Evil: Cold Blooded Killers. Notorious serial killers, including Ted Bundy, John Wayne Gacy, the “Green River Killer” Gary Ridgway and Tommy Lynn Sells, are profiled, and their psychopathic behavior is analyzed by host Michael Stone.
• 9PM, Discovery HD – Accident Investigator: End of the Line. A bus driver is crushed by his own bus; a medical examiner investigates the death of a young girl in a car crash; a man ignores a medical condition.
• 10PM, DIY – Finders Fixers: Flue Symptoms. A faulty gas-combustion furnace and water heater are repaired to stop carbon monoxide from leaking into the house. Included: removing and reinstalling the flue system; proper strapping and hanging of the flue duct.
• 10PM, Discovery HD – Really Big Things: Wind Mill Factory. A retractable roof at the Arizona Cardinals Stadium; the biggest dump truck in the world; a giant windmill turbine.
• 10PM, Military Channel – First World War: Blockade. German submarines attack the civilian ship Lusitania, and America joins the war after intercepting a telegram from Germany encouraging Mexico to attack the U.S.
• 10PM, National Geographic – Tornado Intercept: Following filmmaker Sean Casey as he attempts to literally go inside the eye of a tornado using his “tornado chaser,” a modified (i.e.: fortified) Ford F-450 diesel truck more formally known as a Tornado-Intercept Vehicle.
• 11PM, Comedy Central – Daily Show: Garry Shandling.
• 11PM, HGTV – Junk Brothers: The Chair with Bench and the Wooden Slats. A matching chair and bench become a garden center; wooden slats are turned into a hammock frame.
• 11PM, History Channel – Secret Societies: A look at clandestine organizations, including the Order of Skull and Bones, the Bilderbergs, and the Tri-Lateral Commission.
• 11PM, Discovery Channel – Dirty Jobs: Monkey Caretaker. Mike gets in touch with his inner ape when he travels to South Africa to train monkeys to return to life in the wild.
• 11:30PM, Comedy Central – Colbert Report: David Walker, U.S. comptroller general.