The Citizen Science project "Galaxy Zoo" is periodically updated. Any lab of mine purchased here prior to this update (3/10/2015) may not apply completely to the current website, so I am offering this update free.
What has changed: The Galaxy Zoo now provides to users pictures of galaxies not from the Sloan Digital Sky Survey but from the Hubble Space Telescope CANDELs survey. These galaxies are further away, with a redshift z sometimes greater than 1. This complicates the situation! The new lab addresses this. There are still some problems with the Galaxy Zoo site which I can't help with. Also some users of the updated site may find that it is harder to make out shapes in the further away galaxies.
I have other labs available to be posted (Hubble Law, etc.)