In 2007, Serpentine Gallery Co-Director Hans Ulrich Obrist and artist Olafur Eliasson invited more than 100 leading artists, architects, filmmakers, academics and scientists--including Peter Cook, Simon Baron-Cohen, Gloria Friedmann, Neil Turok, Kim Gordon, Spartacus Chetwynd, Simon Forti, Fia Backstrom and Joseph Grigely--to expand the notion of experimentation for their 24-Hour Experiment Marathon, held in the Rem Koolhaas-designed Serpentine Gallery Pavilion. In the tradition of Obrist's now-legendary ongoing 24-Hour Interview Marathon, the crowds were standing-room-only and the action never stopped. This publication details the more than 40 screenings, performances and experimental films making up this genre-bending blend of science and art.