Only display one fact after ants fact... why?

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fun_facts);

    //Declare our view variables and assign them to the Views from the layout
    final TextView factLabel = (TextView) findViewById(R.id.factTextView);
    Button showFactButton = (Button) findViewById(R.id.showFactButton);
    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {

           final String [] facts = {"Ants stretch when they wake up in the morning.",
                    "Ostriches can run faster than horses.",
                    "Olympic gold medals are actually made mostly of silver.",
                    "You are born with 300 bones; by the time you are an adult you will have 206.",
                    "It takes about 8 minutes for light from the Sun to reach Earth.",
                    "Some bamboo plants can grow almost a meter in just one day.",
                    "The state of Florida is bigger than England.",
                    "Some penguins can leap 2-3 meters out of the water.",
                    "On average, it takes 66 days to form a new habit.",
                    "Mammoths still walked the earth when the Great Pyramid was being built."
                    };

            //the button was clicked , so update the fact label with a new fact
            String fact = "";
            //Randomly select a fact
            Random randomGenerator = new Random(); // Construct a new Random number generator
            int randomNumber = randomGenerator.nextInt(facts.length);

            /*fact = randomNumber + "";*/

            fact = facts[randomNumber];

            //Update the label with our dynamic fact
            factLabel.setText(fact);
        }
    };
    showFactButton.setOnClickListener(listener);


}