question: In what year did Tufts researchers reportedly uncover what is believed to be the oldest known impression of a flying insect ?
answer: 2008
turker_answer: in 2008 Tufts researchers reportedly uncover what is believed to be the oldest known impression of a flying insect
rule-based: Tufts researchers reportedly uncovered what is believed to be the oldest known impression of a flying insect in 2008 .