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Visitors look at a view of the city skyl...Visitors look at a view of the city skyline from the rooftop pool of the Marina Bay Sands resort hotel in Singapore on May 20, 2014. Singapore's trade-reliant economy expanded a seasonally adjusted 2.3 percent quarter-on-quarter the trade ministry said May 20. AFP PHOTO/ROSLAN RAHMANROSLAN RAHMAN/AFP/Getty Images

Roslan Rahman/AFP

The rooftop pool of the Marina Bay Sands resort hotel in Singapore. The nation’s trade-reliant economy expanded a seasonally adjusted 2.3 per cent quarter on quarter, the trade ministry said on Tuesday Read more

A member of Swiss special police forces stands on the roof of the Kongress Hotel next to the Congress Center in Davos, Switzerland, Tuesday, Jan. 21, 2014. The world's financial and political elite will head this week to the Swiss Alps for 2014  gathering of the World Economic Forum at the Swiss ski resort of Davos.

Michel Euler/AP

A member of the Swiss special police force stands on the roof of the Kongress Hotel next to the Congress Centre in Davos, Switzerland. The world’s financial and political elite will head this week to the Swiss Alps for the 2014 gathering of the World Economic Forum at the ski resort

Guests of the Marina Bay Sands

Roslan Rahman/AFP

Guests of the Marina Bay Sands hotel in Singapore look over the city-state’s financial district from a rooftop swimming pool. Read more