hduff writes: "While lithium-ion batteries offer better performance than lead-acid and ni-cad batteries, the supply of lithium is limited and the batteries can pose problems. The Technion-Israel Institute is building a better mousetrap with easily obtainable sand and air."
He's like a function -- he returns a value, in the form of his opinion.
It's up to you to cast it into a void or not.
-- Phil Lapsley