annual health action conference in d.c. former south african president nelson mandela doing better, released from the hospital after being treated for a respiratory infection. mandela is 92 years old. and nasa is marking the 25th anniversary of the space shuttle "challenger" explosion. all seven crew members as you may remember were killed wht shuttle broke apart 73 seconds after liftoff from cape canaver canaveral. nasa officials gathered at kennedy space center for that service. challenger commander dix coby's widow, june is among the speakers. as we told you, in egypt anger is boiling over and the violence continues to erupt and the world is watching. major city of a u.s. ally resembling a war zone. we're talking about cairo, alexandria, where our reporters have been joining us live. then the government, apparently,