Science Extra: Echoes of a tsunami

Strewn throughout the sands of an island in the Great Barrier Reef, shards of pottery lay for thousands of years before an archaeologist quite literally stumbled across them 20 years ago. As more pieces were lifted from the sand, a question was also raised: Who shaped and fired these clay pots? We also get to the bottom of a strange phenomenon that had the earth ringing like a bell for nine days -- and earthquake scientists abuzz for a year. Solve these mysteries and more with science reporters Jacinta Bowler and Carl Smith.