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Tonight on TV

State of the Union Address (7 p.m., Channels 2, 4, 5, 13, CNN, FNC, MSNBC): The broadcast networks' schedules are delayed or pre-empted by news coverage.

Nova (7 p.m., Ch. 7): A look at the art and science of "Fireworks!"

Buffy the Vampire Slayer (7 p.m., Ch. 24): Desperate for cash, Buffy takes a job at a fast-food restaurant.

Gilmore Girls (7 p.m., Ch. 30): The recently retired Richard is driving Emily crazy.

Secret Life of the Brain (8 p.m., Ch. 7): Part 3 (of 5) looks at the mysteries of the teenage brain.

Mark Twain (8 p.m., Ch. 7): The conclusion of Ken Burns' very good two-part biography.

Smallville (8 p.m., Ch. 30): Clark battles an invisible foe who's out to get Lex.

The Real World (8 p.m., MTV): The housemates get jobs as lifeguards.

The Chair (9 p.m., Ch. 4): John McEnroe hosts.

Undeclared (9 p.m., Ch. 13): The guys play truth or dare.