Abstract: The present invention provides a board game for use as a didactic teaching-aid for individuals that are interested in the immune system. The game comprises a playing board having a continuous main course having a plurality of playing spaces. Each playing space contains a number that matches the number of an immune scenario vignette that constitutes an exposure to an infectious disease or to an immune disease state, such as an auto-immune disease or an immune-deficiency. A method of curing or treating the disease, and information about the disease is provided in a disease handout that the players reference while tending to their disease at a hospital, clinic or pharmacy, depending on the nature of the exposure. When a player attains immunity, they become immune to those diseases that are subsequently encountered.

Abstract: An apparatus for distributing liquid over the cross section of a liquid-vapor contacting column comprising a distributor plate having orifices for downward liquid flow and risers for upward vapor flow. Above the distributor plate is a trough for receiving liquid to be distributed. The vapor risers directly below the trough extend through the trough. The trough floor has annular openings around the penetrating vapor risers to discharge liquid onto the distributor plate below.