In today's world, stress is everywhere. Sometimes your to-do list becomes overwhelming. Meditation — even just 30 seconds a day— can help. In this episode of NewsMD's "Health Fusion," Viv Williams talks with a meditation expert who explains how it works, gives a shout out to a study that about how meditation helps US Marines recover from stress and gives tips on how to fit meditation into your day. Give the practice a try on World Meditation Day, which happens yearly on Saturday, May 21.