Article: If you have University, a Sim who reaches the top of the Natural Science career will be rewarded with a Cowplant. Neglecting to feed the Cowplant will make it attempt to lure Sims with its cake-shaped tongue and eat them. Typically a Sim will die upon being eaten, with a few exceptions (if their hygiene is very low, for instance). After a Sim is eaten by the Cowplant, another Sim can milk the plant. The "milk" will extend the drinker's life, similar to the Elixir of Life.

What is a summary?
Use the University Cowplant.