Did you know that the giant clam&nbsp;is the largest clam in the world? Ours was put on display in 2007, when it was a mere eight inches. Now it&amp;#8217;s 2.5 feet! And who knew that a clam could be so colorful? The giant clam&nbsp;(Tridacna gigas)&nbsp;can weigh as much as 440 pounds, grow up to four feet, and live to 100 years or more. And all that on a diet of&amp;#8230;sunlight! The gia