I got this error using macirb but I couldn't reproduce it. Last login: Fri Dec 3 12:40:15 on ttys000 new-host:~ robertrice$ macirb irb(main):001:0> Deg_To_Rad = Math::PI / 180.0 => 0.0174532925199433 irb(main):002:0> Median_Radius_Feet= 20902221.0 => 20902221.0 irb(main):003:0> Median_Rad_Miles = Median_Radius_Feet / 5280.0 * Deg_To_Rad => 69.0932911798298 irb(main):004:0> Median_Rad_Miles = Median_Radius_Feet / 5280.0 / Deg_To_Rad unknown: warning: already initialized constant Median_Rad_Miles => 226819.895028356 irb(main):005:0> 50.0 / Median_Rad_Miles => 0.000220439216735151 irb(main):006:0> x = 50.0 / Median_Rad_Miles => 0.000220439216735151 irb(main):007:0> x * 60.0 macruby(3764,0x7fff7049bca0) malloc: *** free() called with 0x103dcbc60 with refcount 0 macruby(3764,0x7fff7049bca0) malloc: *** auto malloc[3764]: agc error for object 0x103dcbc60: Deallocating a non-block NameError: undefined local variable or method `ￂ' for main:TopLevel irb(main):008:0> Bob Rice