When you look at Legos does "Everything is Awesome" play in your head?
It certainly does for California-based Biomedical researchers. They used 3D printed molds to build a microfluidics system with legos. A number of small lego blocks were made from the molds, and they allow fluid to act like an electrical current. Through the use of syringe pumps, pressure regulators, and more the fluid is controlled at the microscale level.
This technology may be used more in biomedicine.