the world's first looping roller coasters
... that the world's first looping roller coasters were tested with eggs, flowers, glasses of water, and even a monkey before human riders were allowed?
... that <b id="mwA5A"><a class="mw-redirect" href="./Centrifugal_Railway" id="mwA5E" rel="mw:WikiLink" title="Centrifugal Railway">the world's first looping roller coasters</a></b> were tested with <a class="mw-redirect" href="./Egg_(food)" id="mwA5I" rel="mw:WikiLink" title="Egg (food)">eggs</a>, <a class="mw-redirect" href="./Flowers" id="mwA5M" rel="mw:WikiLink" title="Flowers">flowers</a>, <a class="mw-redirect" href="./Glass_(drinkware)" id="mwA5Q" rel="mw:WikiLink" title="Glass (drinkware)">glasses of water</a>, and even a <a href="./Monkey" id="mwA5U" rel="mw:WikiLink" title="Monkey">monkey</a> before human riders were allowed?