What a kilogram weighs
This week, the kilogram was redefined. Perhaps you read about how realizing this new measurement now has something to do with the Planck constant and Kibble balance. Maybe you even heard that the new kilogram could lead to breakthroughs in micro and nanotechnology. What you likely haven’t heard is just how epic the quest was to get here. WGBH's Edgar B. Herwick III has the story.