From my undergraduate days, I've always been interested in the major philosophical questions that don't seem to have an answer that everyone agrees on.
No one questions the validity, the urgency, the essentiality of the Voting Rights Act.
Should President Clinton have killed Osama bin Laden when he had the opportunity in 1990s? Should President Bush have sent the U.S. military into Iraq to depose Saddam Hussein in 2003? Should President Obama have withdrawn all troops from Iraq in 2011? Such questions provide no real insight into future considerations.
There are still so many questions to answer about the workings of the human body and, most mysterious of all, it is influenced by our state of mind.