How appropriate are cholesterol-lowering guidelines? Are Americans really ready for bans on colorful synthetic food dyes? New powerful drugs promise to slash LDL cholesterol—but are they overused? How to stay fit when arthritis limits exercise; The genetics of acute myeloid leukemia; Cattle feed Bovaer promises to curb methane emissions—but critics claim it’s toxic; Carrageenan may prompt insulin resistance, systemic inflammation; Should you really toss that black plastic spatula?