Johnny Mac shares five positive news stories to brighten your Memorial Day weekend. Highlights include a new AI tool called Face Age by Mass General Brigham that predicts biological age from selfies, Harvard Law School's discovery of a genuine Magna Carta, comedian Sebastian Fowler's 3,333-mile cross-country BMX ride for charity, the precision of a new atomic clock called NIST-F4, and the adventurous tale of a loose pet kangaroo named Irwin. 

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