|Milky Way as seen from Paranal. (c) ESO|
Problems with sample selection can also affect our daily life. Think about polls for a Presidential election, like the one we're having in Brazil. Poll companies cannot interview the population of all Brazilian voters, they have to select a sample that is not necessarily representative of the entire population. Indeed, the results of the first round were surprising, candidate Aécio Neves was the runner-up, gathering far more votes than those estimated from the polls. He will face current President Dilma in a second round, on October 26, 2014.