captioning sponsored by macneil/lehrer productions >> brown: george zimmerman appeared in court today after being charged yesterday with second degree murder for the killing of trayvon martin. good evening. i'm jeffrey brown. >> woodruff: and i'm judy woodruff. on the newshour tonight, we get analysis on the legal challenges ahead for both the prosecution and the defense. >> brown: then, margaret warner updates the crisis in syria as the government's guns appear to quiet. >> woodruff: from the pacific northwest, tom bearden reports on efforts to ready the region for the next big earthquake. >> on the average, they occur about every 300 years. the last one was 312 years ago. >> do the math. >> exactly.