Marques Brownlee is a YouTube sensation. The tech-review prodigy has 1.8 million subscribers—more followers than Kanye West, Marvel, or Disney Animation. Under the username MKBHD, he tests everything from cameras and headphones to Google Glass and the latest Tesla. This summer he got his hands on a sapphire crystal display rumored to be for the iPhone 6. In the video, which has gotten about 8 million views, he took keys, his foot, and even a blade to the screen with no result. (Though a follow-up featuring comedian Joe Rogan wielding a crossbow proved it's not indestructible.) The best part: This gadgetry powerhouse is a 20-year-old kid from New Jersey.