Millions do it every year. Travel between San Diego and Tijuana is routine for border residents, but David Carruthers contends that crossing the border is more than just a physical journey.
29 minutes ago in Social Sciences
In Colorado, drilling for oil and natural gas using hydraulic fracturing, sometimes referred to as fracking, is big business. But, questions about its impact on the air and water are far from settled.
49 minutes ago in Environment