A variable cam comprises a cylindrical skirt with a track followed by a roller movable along a guide comprised within a rotating structure, which is coaxial to the skirt. Also described herein are compositions for detecting definitive endoderm. The coiled tubing transportation system runs from the tubing manufacturing unit to one or more movable well drilling systems, and then back to the coiled tubing manufacturing unit. The page table translates the virtual address of a page of data stored in system memory into the corresponding physical address of the page of data. One or more further or additional data elements related to the user are obtained from a third party using the at least one electronic identifier. The touch-sensitive control panel may be adapted to receive user flavor selections, and the computer may control the dispensing controllers responsive to user touches of the control panel and manipulation of the handle.