Some U.S. students are taking it upon themselves to wedge creationism into the classroom, sometimes with snide comments and sometimes with questions.

Missouri high school student Daniel Read said, "I'm going to say as much about God as I can in school, even if the teachers can't."

The student challenges have been so disruptive that some teachers skip the annual unit on evolution, The Los Angeles Times reported Friday.

Liberty, Mo., biology teacher Al Frisby said about half of his students don't believe in evolution.

The American Association for the Advancement of Science is distributing a 24-page guide to teaching the scientific principles behind evolution, from kindergarten to high school. It has also issued talking points to present "both sides."

The annual science teachers' convention -- scheduled to be held in Anaheim, Calif., next week -- will cover similar ground, with workshops on "Teaching Evolution in a Climate of Controversy."

Copyright 2006 by United Press International