A strange conversation given that it is 500 years in the future, The ethnic strains you are referring to would no longer have meaning except to genetic historians. Caucasian is a regional term, Into which there are many ehnic groups and races. Kat is 'New Harmonian' and guaranteed to have many different racial and ethnic genetic origins. What I find more interesting is that the MFDD has the same yield (63 TJ) as 'Little Boy', the Hiroshima Nuke. Not a coincidence I am sure, and the acronym MFDD? I more tend to believe it is in line with the Doom BFG9000 than 'Medium Fusion Destructive Device' I go with MotherF...... destructive device.