Answer
Wally Herbert, a British polar explorer, cast doubt on the validity of Robert Peary's claim to have reached the North Pole in 1909. Herbert's meticulous research and analysis revealed discrepancies and inconsistencies in Peary's accounts and navigation records. His findings, published in his book "The Noose of Laurels," challenged the long-held belief in Peary's achievement, sparking a reassessment of the historical narrative surrounding the exploration of the Arctic.