function _airDrop(MobiusRound storage rnd, uint value) internal {
        require(msg.sender == tx.origin, "ONLY HOOMANS (or scripts that don't use smart contracts)!");
        if(value > 100 finney) {
            
            uint chance = uint(keccak256(abi.encodePacked(blockhash(block.number - 1), now)));
            if(chance % 200 == 0) {
                uint prize = rnd.airdropPot / 2;
                rnd.airdropPot = rnd.airdropPot / 2;
                vaults[msg.sender].totalReturns = add(vaults[msg.sender].totalReturns, prize);
                unclaimedReturns = add(unclaimedReturns, prize);
                totalJackpotsWon += prize;
                emit AirdropWon(msg.sender, prize);
            }
        }
    }