All the latest on former First Lady of the United States, Michelle Obama. The attorney, author and wife of Barack Obama made history as the first African-American First Lady of the United States ...

A United Nations Security Council meeting in two weeks could be a "very good opportunity" for Chinese Foreign Minister Wang Yi and U.S. Secretary of State Marco Rubio to meet, China's U.N. envoy ...

Radial plant growth is driven by a plant stem cell niche known as vascular cambium, usually strictly producing secondary xylem (wood) inward and secondary phloem (bast) outward, two important ...

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