College Park: A Maryland man and a Kansas man have been charged with making separate threats to kill President Joe Biden, authorities said Tuesday. Ryan Matthew Conlon, 37, of Halethorpe, Maryland; and Scott Ryan Merryman, 37, of Independence, Kansas; were both arrested last week, but Conlon’s case was sealed until Monday. He is also charged with making threats to blow up National Security Agency headquarters. Merryman was arrested after he traveled from his home to Maryland. Merryman called police in his hometown last Tuesday and said he was on his way to Washington, DC, to see the president,…