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History fascinates me. I love reading historical books and watching movies with a historic touch. I really admire the archaeologists who spend days and nights in preserving history. Itís such a challenging job to bring historical remains back to their original state. It at times pains me to see how magnificent structures get ruined over the centuries. Once while browsing the net, I came across something called dry ice blasting and how it is used to clean historical structures. I have no idea whatsoever on this thing. I am a little curious to know about this. Maria