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Greg Petsko , the Arthur J. Petsko joins more than a dozen other professors, scientists and scholars from institutions across the country chosen this year for the annual program, which provides undergraduates the opportunity to spend time with America's most distinguished scholars. Over the year, they will collectively visit more than colleges and universities, spending two days at each to meet informally with students and faculty, participate in classroom discussions and seminars, and give public lectures., ...1

Ebola is an infectious disease caused by a virus filovirus. It was first recognised in when two outbreaks were reported in the Democratic Republic of the Congo, near the Ebola River, and in South Sudan., ...1

This unique group of memory and learning-enhancing substances also protect the brain against physical and chemical injury, including oxidation. Many studies have also concluded that vinpocetine has an exceptional ability to reverse the signs of brain, skin and nerve aging. Pyrroloquinoline Quinone PQQ - Vitamin-like compound, powerful antioxidant and nerve growth factor stimulant; improves memory and cognitive functions; reverses cognitive impairment caused by chronic oxidative stress; protects brain and nerve cells; reduces stroke., ...1

Finding blood in your urine does not automatically signal a life-threatening disease, but normally, healthy urine should not contain any detectable amounts of blood. Sometimes, consuming food dye or an excessive amount of beets can also color your urine., ...1

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser., ...1