Polling stations opened in Poland for the second and decisive round of presidential elections. The two candidates who received the most votes in the first round two weeks ago are going head-to-head today in the presidential race - Warsaw's liberal mayor Rafal Trzaskowski and right-wing nationalist Krzysztof Bosak, a historian by profession. According to recent polls, the race between the two is extremely close, with Warsaw Mayor Trzaskowski leading Bosak by only 1%, well within the margin of error.