A deaf hiker is safe after a rescue operation in Simi Valley, California. The 14-year-old son of Tereza Kristall reported her missing last night. The 45-year-old was text messaging the teenage, saying she was on a steep hill where she had fallen and temperatures were dropping. Emergency workers were able to find her using GPS data from her phone to guide a rescue helicopter. Kristall was treated for hypothermia and injuries she recieved in a fall.