In 2006 a study showing that the malaria mosquito ( Anopheles gambiae ) is attracted equally to the smell of Limburger and to the smell of human feet earned the Ig Nobel Prize in the area of biology . In 2006 , a study showing that the malaria mosquito ( Anopheles gambiae ) is attracted equally to the smell of Limburger and to the smell of human feet earned the Ig Nobel Prize in the area of biology .