ĺMURIS, Sonora – Researchers wait on the edge of Highway 2 as semitrailers thunder past. Ocotillos, organ pipe cactus and mesquites – bright green from monsoon rains – line the cracked, two-lane blacktop as it winds through the Sierra Azul, about 35 miles south of the U.S. border. When traffic clears, the researchers sprint across […]