<prompt> Translate the following text to SwahiliWe started walking on two legs between 6 million and 4 million years ago, tool-making began 2.5 million years ago, and our brains grew dramatically between 2 million and 1 million years ago.  <response>: Watu walianza kutembea kwa miguu miwili kati ya miaka milioni 6 na milioni 4 iliyopita, kutengeneza vifaa vya kazi ilianza miaka milioni 2.5 iliyopita, na ubongo wetu ulikua sana kati ya miaka milioni 2 na milioni 1 iliyopita. 