HN has Alexa rank of 7000, while slashdot has about 1000. When I look at HN Alexa rank, a big jump happened in the last month. Anyone knows why? I like HN mysel

HN has Alexa rank of 7000, while slashdot has about 1000. When I look at HN Alexa rank, a big jump happened in the last month. Anyone knows why? I like HN myself, the philosophy suits me better...