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My son built this in about an hour and was thrilled when the rubber-band launch actually sent the car across the room. The elastic band mechanism is a clever way to teach momentum without needing batteries.

The rubber-band mechanism snapped into place easily and my kid got the momentum concept right away when the car shot across the floor. We've rebuilt it three times already, and each run still gets a cheer.

The rubber band mechanism clicks into place satisfyingly, and my son understood momentum after just a few test runs. We've built it three times now, tweaking the axle alignment to see if it goes further.