A sinkhole in Florida this week appeared in nearly the exact same location as a previous sinkhole that swallowed up and killed a man in his sleep back in 2013. With chilling confirmation that sinkholes can and do strike the same place twice, we need a better understanding of the science of sinkholes. CBSN, the "Always On" online news network from CBS NEWS, invited Dr. Michio Kaku to explain these geological events and offer his suggestions on what we can do about them. WATCH NOW!