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NPR's Joe Palca reports that physicists have found evidence challenging the assumption that fundamental particles called "top quarks" can't be divided into yet smaller structures. Researchers at the Fermi National Accelerator Laboratory in Batavia, Ill., were surprised to find indications that quarks have internal structures. If this turns out to be true, it would contradict the Standard Model that physicists have long used to explain the basic structure of all matter. 17. MAYBE VOOM -- A reading from "The Cat in the Hat Comes Back" by Dr. Seuss. The cat, you'll remember, comes back to reveal another cat under his hat, who has another cat under his hat, who has another cat, and so-on. The cats get smaller until there's only VOOM left.

Producers Ginna Allison and T.J. Meekins sent us this piece about Rose Maddox, who's known as the grandmother of rockabilly music. Rose got her start in the 1930s, when she was just 11 years old. She went on to perform with country greats like Johnny Cash and Merle Haggard. And this week, her latest album is up for a Grammy.

Commentator Jack Beatty [beety] says the time has come for Congress to pass comprehensive campaign finance reform legislation. He says the current system, in which members of Congress spend much of their time raising funds, is one of the reasons many of our best lawmakers are leaving public office.

of the Farm Bill. After being delayed for several days by democrats, the GOP backed-measure won by a 2-to-1 majority. Its biggest departure from farm bills of the past are the government subsidies paid to farmers. The House will vote on its version of the bill in three weeks.

NPR'S DEAN OLSHER ATTENDED A MEMORIAL SERVICE YESTERDAY FOR THE JOB CORPS STUDENTS KILLED IN THE TRAIN ACCIDENT LAST WEEKEND IN SILVER SPRING, MARYLAND.

Robert talks to two actors from the Royal Shakespeare Company, who are here in Washington performing "A Midsummer Night's Dream" at the Kennedy Center. They are Desmond Barrit, who plays Bottom, and Lindsay Duncan, who plays Titantia. Barrit was an accountant until he was 35 years old and then became on actor on a bet.

As part of our continuing election coverage, we have been running excerpts from the standard stump speeches of the Republican presidential candidates. Tonight it's Pat Buchannan's turn.

A PROFILE OF THE MONTREAL JUBILATION GOSPEL CHOIR, ONE OF CANADA'S MOST BELOVED CHORAL GROUPS. 17:00 (CD'S BY THE MONTREAL JUBILATION GOSPEL CHOIR AVAILABLE THROUGH JUSTIN TIME RECORDS, INC.; 5455 PARE ST., SUITE 101; MONTREAL, QUEBEC - CANADA H4

REPORTER KAREN MICHEL EXAMINES HOW POLLUTION AND THE DAILY WEAR FROM THOUSANDS OF VISITORS MAY BE THREATENING ONE OF THE WORLD'S GREAT PIECES OF ARCHITECTURE -- INDIA'S TAJ MAHAL.

FEBRUARY 25,