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Recently, CNN s Nick Glass investigated the very delicate matter of whether or not it s high time to clean the Mona Lisa.
03:47 — Nick Glass meets the team behind the Bloodhound SSC -- a car aiming to go 1000 miles/hour and set a new land speed record
03:48 — CNN's Nick Glass meets Dr Matt Taylor who played a key role in Rosetta's rendezvous into deep space.
01:52 — Nick Glass sits down with Matt Taylor, a Rosetta Project scientist, to talk about the logistics of landing on a comet.