How many workers is did it take to build Burj Khalifa?

What was the name of Sir Lancelot's castle? What percentage of the Great Wall of china exist today? What percent Albedo's the Sahara Desert? Why do Hindus scatter ashes of the dead into the river? How many types of Irish dancing are there in River Dance? What do people use to go over Niagara Falls in? Which climate has a strong growth of deciduous trees and coniferous forests? What can you smell in Six Flags? Why is delta? Where is the Atlantic Coca-Cola Center And Museum in Atlantic Iowa located? How do you build stand alone rock wall? What president's wife was named Abigail? Who lived on the land west of the Mississippi. River? What is the value of a 1877 us dollar coin? What are the negative impacts of tourism in goa? What city is coacoa beach in? What was the role in egypian trade in the eastern and nile valley? Are there locker rooms at ocean park Hong Kong? What constitutes a body of water being called a lake? Who influenced Abigail Adams to do what she did to make this world a better place?