         
         bomb.physicsBody = SKPhysicsBody(rectangleOf: bomb.size)
         bomb.physicsBody?.categoryBitMask = bombCategory
-        bomb.physicsBody?.contactTestBitMask = PhysicsCategory.All
+        //bomb.physicsBody?.contactTestBitMask = PhysicsCategory.All
         bomb.physicsBody?.collisionBitMask = physicsCategory
+        bomb.physicsBody?.affectedByGravity = false
 
         
         addChild(bomb)

        rightSquirrel.anchorPoint.y = 0.5
        rightSquirrel.zPosition = 1
        rightSquirrel.physicsBody = SKPhysicsBody(rectangleOf: rightSquirrel.size)
        rightSquirrel.physicsBody?.isDynamic = false
        rightSquirrel.physicsBody?.categoryBitMask = PhysicsCategory.RightSquirrel
        addChild(rightSquirrel)
        

import MultipeerConnectivity

struct PhysicsCategory {
    //static let None      : UInt32 = 0
    //static let All       : UInt32 = UInt32.max
    static let RightSquirrel    : UInt32 = 0x1 << 0
    static let LeftSquirrel     : UInt32 = 0x1 << 1
    static let LeftBomb         : UInt32 = 0x1 << 2
    static let RightBomb        : UInt32 = 0x1 << 3
    static let Environment      : UInt32 = 0x1 << 4
}

class GameScene: SKScene, SKPhysicsContactDelegate {
