This works for me ... and appears to be the correct answer? Not sure what I'm doing wrong? Thanks for any advice!

<?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',
);
//add your loop below this line

for($i = 1; $i <= 100 ; $i++) {
    echo $i . "<br/>\n";
    if (isset($facts[$i])) {
      echo $facts[$i]. "<br/>\n";
    }
}