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Cool site that explains how BB-8 works, via laughingsquid.
BB-8 is an astromech droid that appears on Star Wars Episode VII – The Force Awakens. It has a ball shaped body and a domed head that resembles that of the R2 series droids, whose most popular unit is R2-D2. BB-8’s body rolls independently from the head, which always stays near the vertical axis of the droid.
