A new study from Northwestern University shows what many mothers already know: their babies are a lot smarter than others may realize. (Credit: iStockphoto/Jason Lugo)ScienceDaily (May 7, 2009) — A new study from Northwestern University shows what many mothers already know: their babies are a lot smarter than others may realize.Though only five months old, the study's cuties indicated through their curious stares that they could differentiate water in a glass from solid blue material that looked