During preparations for the games, tributes are required to participate in public interviews. People also loved Katniss's interview more than the rest of the tributes.
Birds created by the Capitol during a time of rebellion in order to spy upon districts. Jabberjays were created to record and repeat conversations and alert the Capitol of trecherous disscustions.
Katniss and Peeta threaten to take these berries so they both die and no one would win. So they were stopped by the head game maker and were both crowned victories.
Reaping is the name of the annual district ceremonies where two tributes, a male and female are selected by a lottery to enter the Hunger Games. At the reaping Katniss volunteered for her sister's spot.
Outside of Panem, the state of the world and universe at large is unknown in the Hunger Games. The affairs of Panem comprise the entire focus of the story.
Girl tribute from District 5 ate Peeta's poison berries and died. She is in the Her name is not FoxFace, Katniss gave her that nickname because she looked like a fox.