Musical instrument craftsmans Michael Geilert and Manfred Paulus work on world's largest functional tuba at the Musikinstrumenten-Museum on March 8, 2013 in Markneukirchen, Germany. The tuba is exactly double the dimensions in every respect to a normal tuba, and twenty local artisans crafted it in 2010 as part of celebrations around the town's 650th anniversary. The tuba will soon travel to Frankfurt, where it will be displayed at the 2013 Music Trade Fair. Markneukirchen has a rich tradition of brass and wood musical instrument manufacture dating back to the 17th century. (Getty Images)
From underwater mining to luxury yachts, Mohammed Al Barwani has interests in a staggering range of industries. The chairman of MB Holding explains how he built the firm from scratch to become a billion-dollar player.