Abstract: A radio frequency identification (RFID) automatic vehicle identification (AVI) system configured to mitigate signal interference, the system comprising a plurality of RFID readers, comprising a first RFID reader and a second RFID reader; and a plurality of antennas, wherein a first antenna is connected to the first RFID reader and a second antenna is connected to the second RFID reader. Prior to the first RFID reader transmitting a signal through the first antenna, the first RFID reader samples a received radio frequency (RF) signal from the first antenna, and if the received RF signal meets predetermined strength and frequency criteria, the first RFID reader inhibits transmission of the signal through the first antenna.

Abstract: The game for teaching binary mathematics includes a plurality of balls, a backboard, and a plurality of elongate members selectively connected to each other and to the backboard in non-horizontal directions. A plurality of gate sections are pivotally connected to the backboard and engageable with select ones of the plurality of members so that the gate sections can be pivoted between open and closed positions respectively. Select ones of the plurality of balls may cause corresponding ones of the plurality of gate sections to pivot between open and closed positions after passing thereby. Corresponding 0 and 1 binary values are assigned to closed and open ones of the plurality of gate sections, respectively, so that a number of the plurality of marbles that have been introduced to the game can be determined by adding the corresponding 0 and 1 binary values.