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EIA US Energy Information Administration Energy in Brief

"Students will utilize conservation of mass-energy to explain how the annihilating collision of a proton and an anti-proton can produce a particle with six times the mass of either."

Hydrogen fuel cell cars, whose only tailpipe emission is water, are often hailed as one solution to our energy woes. But many hurdles remain, including lowering the cells' cost, building filling stations, and finding green ways to produce hydrogen. Meantime, our NOVA scienceNOW host test-drives a prototype fuel cell car, with "Car Talk" hosts Tom and Ray Magliozzi along for an amusing ride.

ed simanek discussion of newton's cradle and the special cases involved