A car that runs on water? Not sure if this is technically speaking a "real" fuel cell - especially given the price of the kit. It's certainly not the fuel cell that made news a few years back: the kind that splits water molecules to get hydrogen fuel. But it's still pretty cool. This "fuel cell" works from the chemical reaction that happens a drop of salted water makes contact with a Magnesium sheet. The kit includes three Magnesium metal sheets and each sheet will run the car for about 5-7 hours of continuous operation (remove and rinse off the FC module to save power when not in use). At the very least this is a fun novelty car. And, if the included guide book does a good job of explaining the science behind the effect, it will be an excellent hands-on learning opportunity... more on that after we play test it.