By Chris Matyszczyk Technically Incorrect: A middle school basketball game carries on with the referee signaling calls one-handed. In the other, he’s making a call.
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Source:: http://cnet.com.feedsportal.com/c/34938/f/645093/s/421a3920/sc/35/l/0L0Scnet0N0Cnews0Cref0Eofficiates0Ebasketball0Egame0Ewhile0Eon0Ephone0C0Tftag0FCAD590Aa51e/story01.htm