| 1 | A hospitality exchange is a network of people around the world who offer free accommodation to travelers. | |
| 2 | As a group, black Americans include many of the world' s richest and most famous personalities. | |
| 3 | THE debate over gay marriage is at the heart of many races in America's mid-term elections. | |
| 4 | Nigeria, Africa's most populous country, has more than 200 ethnic groups and is roughly equally split between Christians and Muslims. | |
| 5 | The team also noticed that the deepest communication appeared between doctors and patients that were of the same ethnicity or race. |
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