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.
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