Mac can't detect your Android device

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http://www.mkyong.com/android/android-debugging-on-real-device/
http://stackoverflow.com/questions/7135999/adb-not-finding-my-device-phone-macos-x

adb kill-server ; adb devices

If you installed EasyTether, it will interfere with ADB, you should disable EasyTether. 

Disable EasyTether:
sudo kextunload /System/Library/Extensions/EasyTetherUSBEthernet.kext 
   
Enable EasyTether:
sudo kextload /System/Library/Extensions/EasyTetherUSBEthernet.kext

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