The cradle of the cradles of planets

Planets form in tiny disks around newly-born stars. Hundreds of high-resolution images of these disks have been taken over the last decade showing a variety of diverse morphologies that are somehow connected to the diversity observed in planetary systems. Now, the sample of disks observed is mature enough to enable demographic studies on several disk properties and their connection with environmental, stellar, and other disk properties. The techniques, the instruments, and the main results of our study are presented in this talk, with a particular view of three star-forming regions where tens of planets are being formed.