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Cruise lovers who hate being stuck with the expensive shore excursions offered by their cruise line can now find better value alternatives, thanks to a website launching today: Viator Shore Excursions.

Sometimes solving the biggest challenges begins with understanding something very small -- like the tiny grains that form a piece of metal. For a team of scientists who wanted to improve automotive fuel efficiency, understanding and controlling the size of the grains in aluminum allowed the design of an easy and inexpensive method for producing lightweight automotive parts, replacing heavier steel, leading to improved fuel efficiency

Beauty salons take extreme measures to protect their expensive hair extension supplies, which are being targeted by thieves and causing some companies hundreds of thousands of dollars in losses. NBC's Jennifer Bjorklund reports. (Nightly News)