How far would you go to avoid a rash from a common pest on hikes? Well, one reporter for The Wall Street Journal has gone as far as to blend poison oak into smoothies and mix them into his salad bowl — all in a bid to develop an immunity towards the chemical irritants found in the plant's leaves. Jeff Horwitz, who usually reports on technology, wrote about his slightly mad mission for a feature article in the Saturday newspaper. "I started eating poison oak in January, when the first buds began to swell on the hazardous plant’s bare stems,"...