Bin Laden recounted his experiences at Tora Bora on an audiotape that aired on Al Jazeera in 2003. He recalled that, on the morning of December 3, heavy U.S. bombing began around the clock, with B-52s dropping some 20 to 30 bombs each.
unwind. 1  to wind off or undo (something wound) 2  uncoil. 3  to straighten out or untangle (something confused or involved) 4  to make relaxed, less tense, etc. 5  to close out (a position in a securities or commodities trade) to sell (a stake in a company, business venture, etc.)
An enzyme known as a helicase is required to unwind DNA from a double-strand structure to a single-strand structure to facilitate replication of each strand consistent with the semiconservative model of DNA replication. Error correction is a property of some, but not all, DNA polymerases.