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US President Barack Obama bid farewell to the world stage Sunday, pondering his legacy, offering advice to his successor and discussing his post-presidential life at the end of his final foreign tour.His historic presidency and charisma have made Obama a rock star on the international scene, even at ti adidas samba mes when the daily grind of politics dimmed the glow around his election as the United States' first black president in 2008. Obama spoke to both the American people and the world as he gave his final foreign press conference in Lima, Peru.But ultimately, those two audiences are inseparably linked, he insisted. It was a key message as he prepares to hand over to President-elect Donald Trump -- nb 993 who has spooked some in the international community with his volatile style and isolatio newbalance 9060 nist rhetoric. Several of Obama's fellow world leaders said an emotional goodbye as they wrapped up a summit. w Zealand's Prime Minister John Key (L), US President Barack Obama (2L), Australia's Prime Minister Ma Be it booking flight tickets, buying a car or finding a new apartment, we always come up against the same question: Should I strike while the iron's hot, or wait until a better offer comes along? People often find it difficult to make decisions when options are presented not simultaneously but one after a nike store dunk nother. This becomes even more difficult when time is limited and an offer that you turn down now may no longer be available later."We have to make decisions like this countless times every day, from the small ones like looking for a parking space to the big ones like buying a house or even choosing a partner," says Christiane Baumann, a doctoral candidate in the Department of Psychology of the University of Zurich. "However, until now, the way we behave in such situations has never been thoroughly examined." Under the leader yeezys slide ship of cognitive psychologist Bettina von Helversen (pre asics gel kayano viously UZH, now University of Bremen) and in collaboration with Professor Sam Gershman (Harvard Universit