It's Matz and... Someone else (sorry if it's obvious - I don't know). And of course they are programing in the bath. BigDecimal: You can handle numbers as large as can fit into memory as opposed to the IEEE double #rubykaigiBigMath is the Math module for BigDecimal #rubykaigiLots of different rounding modes in BigDecimal #rubykaigiBigDecimal.mode is global per process - not thread safe #rubykaigiS