CBS News medical correspondent Dr. Jon LaPook and CBS News contributor Dr. Holly Phillips join “CBS This Morning: Saturday” to discuss President Obama’s announcement to help combat the abuse of prescription opioids and heroin. Also, a new Cornell study suggests that, depending on our heritage, eating “green” could be in our genes. Source

Police in Phoenix are frustrated. Five months after a serial shooter began attacking — killing seven people — there are few leads and no motive. On Thursday, city officials called a news conference to say they’re not even close to solving the crimes. Mireya Villarreal reports. Source

Air travelers know – or should know – there are lots of things you aren’t supposed to take aboard a fight, including various liquids, spray cans and toys. But the TSA has seen a big jump in the number of firearms coming into airport checkpoints. CBS News transportation correspondent Kris Van Cleave joins “CBS This Morning” to identify top airports where firearms were found, break down the serious consequences and the effort to shorten the long wait times on security lines. Source

Neighbors turned out by the hundreds Friday night for an emotional vigil to remember Shanann Watts and her two young daughters in Frederick, Colorado. The vigil was just days after husband Christopher Watts reportedly confessed to killing his wife. Omar Villafranca reports. Source

Very intense negotiations between Iran and the U.S. over Tehran’s nuclear program resumed Saturday. Both sides agree that serious problems remain despite a major diplomatic push by Secretary of State John Kerry and European diplomats seeking an interim deal. Elizabeth Palmer reports. Source

Aerial photography used to be reserved only for the professionals but as smartphones have changed the way people take pictures, so have new travel opportunities. Flights and views that were once almost impossible to get are becoming routine — making for a spectacular surge of aerial photography nationwide. Jeff Glor reports. Source

More flooding is expected in the Northeast and Mid Atlantic states. Torrential rain in Virginia forced the closing of many roads because of rising water, and waist deep water flooded parts of a park in Washington. Vinita Nair reports. Source

Chef Jason Santos’ style has been called “Julia Child meets Willy Wonka.” The chef and owner of three top Boston restaurants joins “CBS This Morning: Saturday” to share his ultimate dish. Source

An army of volunteers has been helping with rescues in Texas. A monster truck driver saved victims with his huge rig, driving deep into flood waters to shuttle stranded residents to safety. Michelle Miller reports. Source

After five years of bloodshed, the first ceasefire since Syria’s civil war began is underway. Elizabeth Palmer is among the few western reporters to get inside Syria. Palmer reports on the pause in the fighting, which if it lasts, could be a precursor to peace talks in March. Source