Off Ramp’s first exotic field production, All the Salt in China was shot near Lanzhou, circa 2000, on the elusive subject of iodine deficiency. Micronutrient and vitamin deficiencies are tough subjects for a filmmaker. But this is arguable the work that the UN does best. If people could be made aware of how much the UN and its partners have improved basic health indicators around the world, they’d understand how important the international organization is. The challenge with this sort of subject is to tell a story in a way that gives something mostly invisible emotional resonance.