Daily 5: Nendo completely rethinks the door, Twitter could be dying, and the US Department of Energy just 3-D printed a car.

1) Award-winning design firm Nendo rethinks the door in 7 cool new ways

2) Watch Jimmy Fallon and Robert Downey Jr. have an emotional roller-coaster of a convo

3) Is Twitter dying?

4) Not all tech execs own yachts. These guys have chosen to be frugal with their funds

5) We’re 3-D printing cars now? Seriously?