During the hard exploring period, a PU foam professor questioned to Mr. Joshua:" Why do you insist on earplugs? You can choose any other products if you like, I can help you. " But Mr. Joshua say no thanks! He knew again it was very valuable undertaking because many governments including China had issued laws to protect workers hearing. And also there are almost 400 millions people still having problem with sleeping and earplugs can help them from insomnia. Aafter years communication, the professor informed he recognized what Mr. Joshua have done was great work for human. "Wish your earplugs dream become true soon!"