Mary Roach, author of "Grunt: The Curious Science of Humans at War"

Science writer Mary Roach

AUTHOR MARY ROACH
Author Mary Roach is photographed at her home in Oakland, Calif., on Wednesday, May 25, 2016. Roach's new book "Grunt: The Curious Science of Humans at War," will be out on June 7. (Jane Tyska/Bay Area News Group)
AUTHOR MARY ROACH
Author Mary Roach is photographed at her home in Oakland, Calif., on Wednesday, May 25, 2016. Roach's new book "Grunt: The Curious Science of Humans at War," will be out on June 7. (Jane Tyska/Bay Area News Group)
AUTHOR MARY ROACH
Author Mary Roach is photographed at her home in Oakland, Calif., on Wednesday, May 25, 2016. Roach's new book "Grunt: The Curious Science of Humans at War," will be out on June 7. (Jane Tyska/Bay Area News Group)
AUTHOR MARY ROACH
Author Mary Roach is photographed at her home in Oakland, Calif., on Wednesday, May 25, 2016. Roach's new book "Grunt: The Curious Science of Humans at War," will be out on June 7. (Jane Tyska/Bay Area News Group)