What we are (re)learning on the Pathway to Petascale:

• It is no mere coincidence that 5/7 of "default" is "fault"

  • Constants aren't, variables don't

  • Murphy's Last Theorem holds....in spades

• Computation vs. Communication: Recompute vs. Store/Share

• Data: Location, Location, Location

• Mapping the Science vs. Mapping the Math