If i remember correctly EEniac was a whole floor as well...but the building was an entire urban city block...

They hired women to SWEEP the moths out from all the vacuum tubes...hence the name bugs was born for computer issues.Moths? Bugs?  A bit off topic? No, early  computers had 'bugs' for sure.
http://en.wikipedia.org/wiki/Grace_Hopper
Quote

Rear Admiral Grace Murray Hopper (December 9, 1906 – January 1, 1992) was an American computer scientist and United States Navy officer. A pioneer in the field, she was one of the first programmers of the Harvard Mark I computer, and developed the first compiler for a computer programming language.[1][2][3][4][5] She conceptualized the idea of machine-independent programming languages, which led to the development of COBOL, one of the first modern programming languages. She is credited with POPULARIZING the term "debugging" for fixing computer glitches (motivated by an actual moth removed from the computer). Because of the BREADTH of her accomplishments and her naval rank, she is sometimes referred to as "Amazing Grace". The U.S. Navy destroyer USS Hopper (DDG-70) was named for her.

I had always thought the original "bug" was a dead moth trapped between the moving and fixed contacts of a relay. Geek's meaning and intentions are often impenetrable to ordinary mortals.