This is how the biocomputer is made

The (sometimes) significant amount of heat generated by the computer can also be used to grow wheatgrass.

Mike Schropp gives detailed instructions on how we can grow wheatgrass on top of a computer case. The blogger was the first to purchase a Pentium 4-based PC that is known to have significant heat production. In the second step, the upper part of the house has been remodeled, making it easier to utilize the warm air. Of course, the tray containing the topsoil took up space here, as anyone who didn’t hang out much from a physics class would surely remember that the warm air was flowing upward. Four pipes were also used for more optimal heat dissipation. Wheatgrass does not require special care anyway, so it can be a particularly advantageous choice for geeks as well. 

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According to Mike Schropp, a ground temperature of 19 degrees is enough for ideal growth, which is relatively easy to achieve. If the temperature is significantly higher than this, growth may slow down. The wheat grass produced in this way can also be used as a dietary supplement, but it can also be used in various beverages. The total cost of the conversion kicked in at just $ 10.  

Detailed modding here readable. 

Source: totalgeekdom.com