Nice site! I think that it could also be a nice feature to sum the number of hours that a thinker did each type of activities. Did Voltaire sleep more than me? Do I exercise as much as Victor Hugo? These questions could be easily answered with this small addition.
I agree, definitely a big potential here. They say that there is a $16 billion potential in claim each year, which is a pretty huge pie. Does anyone know how much of this is currently claimed each year?