I must confess that I am not easily impressed by computer science innovations. Trust me there, Pranav Mistry belongs to the "World Changer" club.
His bio at TED says:
Pranav Mistry is a PhD student in the Fluid Interfaces Group at MIT’s Media Lab. Before his studies at MIT, he worked with Microsoft as a UX researcher; he’s a graduate of IIT. Mistry is passionate about integrating the digital informational experience with our real-world interactions.
Some previous projects from Mistry’s work at MIT includes intelligent sticky notes, Quickies, that can be searched and can send reminders; a pen that draws in 3D; and TaPuMa, a tangible public map that can act as Google of physical world. His research interests also include Gestural and Tangible Interaction, Ubiquitous Computing, AI, Machine Vision, Collective Intelligence and Robotics.
What it doens’t say is that he manages to put all this into bright while simple concepts. Enjoy the video!