Science Reporter Sophisticated new tests confirm that Ludwig van Beethoven suffered severe lead poisoning, which could explain his cranky personality. But lead poisoning probably is not the reason why the great composer lost his hearing, researchers announced Tuesday. In 2000, tests of Beethoven's hair at southwest suburban Argonne National Laboratory showed he had lead concentrations roughly 100 times higher than levels found in healthy adults today. But hair analysis is not scientifically conclusive. Moreover, skeptics said, hair samples used in the test could have been contaminated by, for example, hair powder, dirt or grease. But a new test at Argonne,...