U.S. President Barack Obama Tuesday unveiled a decades-long project designed to map the inner workings of the human brain, seeking answers to such challenges as epilepsy, autism, and Alzheimer\'s disease. \"There\'s this enormous mystery awaiting to be unlocked,\" Obama said in the East Room of the White House. The $100 million project is part of Obama\'s fiscal year 2014 budget, which will be proposed next week, meaning Congress must approve the amount.