All times eastern

• 6PM, Discovery Channel - How It’s Made: Ropes; billiard tables; sailboards; cymbals.
• 6PM, National Geographic - Hooked! Monster Fish: Large fish are spotlighted. Included: the Mekong catfish, marlin and other bait fish. Also: anglers’ techniques for catching big fish.
• 6PM, Discovery HD - Really Big Things: Swing Bridge. Host Matt Rogers checks out the Evolution locomotive in Erie, Pa.; a dredger on the Mississippi River; and the Spokane Street swing bridge in Seattle.
• 6PM, Fuse - The Sauce: A magazine program that features music news, lifestyle information and celebrity guests.
• 6:30PM, Discovery Channel - How It’s Made: Aluminum pots and pans; artificial limbs; peanut butter; high-intensity light bulbs.
• 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 and on after the jump!

• 7PM, Food Network - Good Eats: Water Works I. Part 1 of two on water examines how it goes from natural sources to kitchens and how it is purified.
• 7PM, Weather Channel - Storm Stories: Moroccan Sandstorm. Two rally drivers are lost in the Moroccan desert during a sandstorm.
• 7PM, History Channel - Modern Marvels: The Colosseum. The Roman Colosseum, built in A.D. 70, is the subject.
• 7PM, Discovery Health - Impact: Stories of Survival: The Risks of Rodeo. A cop is pinned between two cars, breaking his legs; a bullrider is bucked, stepped on and thrown on his head; a snowmobile accident results in brain damage, a coma and a punctured lung.
• 8PM, NBC - The Office: The Job, Parts 1 and 2. In the hour-long Season 3 finale, the desk jockeys reflect on their day of beach competitions. Meanwhile, a corporate job opening sparks competition at Dunder Mifflin, as Michael, Jim and Karen journey to New York for interviews.
• 8PM, National Geographic - Naked Science: Moon Mysteries. Exploring the moon’s effect on Earth and its evolution: how its gravitational pull affected Earth’s daily cycle, seasons, tides and primitive life; and how it might play a role in triggering natural disasters today.
• 8PM, Discovery Times - New Detectives: Hidden Obsessions. Included: a torso washes up on the Great Miami River, puzzling investigators as to the whereabouts of the other body parts and the victim’s gender. Also: a finger is found in a dumpster.
• 8PM, Discovery HD - Planet Earth: Fresh Water. Fresh-water environments are explored, including rivers and lakes. Featured: Lake Baikal in Russia; Angel Falls in Venezuela. Also: underground aquifers.
• 9PM, Food Network - Cake It to the Limit: Duff Goes to Hollywood. A birthday cake for “Tonight Show” host Jay Leno; a local Brownie troop gets decorating lessons; a crab-themed birthday cake.
• 9PM, History Channel - Mega Movers: Ancient Mystery Moves. Ancient moving projects that baffle scientists as to how the massive objects were relocated are examined, including the monoliths of Easter Island; and Trilithon stones of Baalbek, Lebanon.
• 9PM, PBS (NY 21) - Supernatural Science: Monsters from the Lake. The Loch Ness Monster is examined.
• 9PM, Travel Channel - 1000 Places to See Before You Die: Nepal
• 9:30PM, Speed - American Muscle Car: Ram Air! Air’s impact on maximizing horsepower is examined.
• 10PM, Showtime - Penn & Teller: Bullshit!: Nukes, hybrids and lesbians are the topics.
• 10PM, TLC - Wrecks to Riches: Barry and his team search for a ‘68 Mercury Cougar.
• 10PM, Discovery HD - Equator: Battle for the Light. Examining the rain forests of southeast Asia, and the diversity of life they produce.
• 10PM, ABC - Lost: A series recap exploring questions that have been answered and those that haven’t. Executive producers Carlton Cuse and Damon Lindelof host.
• 11PM, Comedy Central - Daily Show: Author Brink Lindsey.
• 11PM, History Channel - Modern Marvels: Future Tech. The future of technology is discussed, including a look at current prototypes.
• 11:30PM, Comedy Central - Colbert Report: Tom DeLay; author Randy Kearse.