Lego wants to completely remake its toy bricks

At the heart of this town lies a building that is a veritable temple to the area's most famous creation, the humble Lego brick. It is filled with complex creations, from a 50-foot tree to a collection of multicolored dinosaurs, all of them built with a product that has barely changed in more than 50 years.A short walk away in its research lab, though, Lego is trying to refashion the product it is best known for: It wants to eliminate its dependence on petroleum-based plastics, and build its toys entirely from plant-based or recycled materials by 2030.

That's one heck of a materials science challenge.