Use the function isset to test if the incremented value equals one of the keys in the $facts array. If there is a ke

<?php
$facts = array(
    57 => ' on Heinz ketchup bottles represents the number of varieties of pickles the company once had.',
    2 => ' is the approximate hours a day Giraffes sleeps',
    18 => ' is the average hours a Python sleeps per day',
    10 => ' per cent of the world is left-handed.',
    11 => ' Empire State Buildings, stacked one on top of the other, would be required to measure the Gulf of Mexico at its deepest point.',
    98 => '% of the atoms in your body are replaced every year',
    69 => ' is the largest number of recorded children born to one woman',
);
sort($facts);
//add your loop below this line
for($i=1;$i<=100;$i++){
  if(isset($facts)){
    echo $facts[$i];
  }

}