The 1905 Russian Revolution was, though no one knew it at the time, the rehearsal for the 1917 Russian Revolution. Dave takes us from Bloody Sunday to the calculations and miscalculations of the Tsar; Justin uses everyone from Lars Lih to Isaac Deutscher to Simon Sebag Montefiore to draw some pictures of what Lenin, Trotsky, and Stalin — you’ll be hearing more about these three — were up to in 1905…