Texas Instruments, Alzheimer's, Same-Sex Classrooms

...In Dallas: MORNING NEWS readers are e-mailing this in-depth business story about Texas Instruments, and the art of reinventing the business model.

…In St. Louis: POST-DISPATCH readers are interested in separate classrooms for boys and girls.

…In Los Angeles:  The LA TIMES has reporters covering the drug violence in Mexico, and readers are e-mailing this story about the pros and cons of having the Army take over from the local police.

…In New York: TIMES readers quickly broadcast this food story that shows a better way to cook pasta.

…In San Fransicso: SFGate readers get the latest on Alzheimer's disease; this story highlights the link between the disorder and mad cow disease.