What a cold winter means for ticks and mosquitoes

Like many of us, the bugs have been hunkered down waiting for spring to return. CDC/ James Gathany; William L. Nicholson, Ph.D. (left). Breakthroughs, discoveries, and DIY tips sent six days a week. With days to go until the official first day of spring, it was a tale of two winters in the continental United States. Colorado's mountains had record low snow levels, while Salt Lake City and Phoenix were among the cities who had their highest winter temperatures on record .