Examines the concept of sex discrimination from the point of view of data, which often defaults to male and thus makes women numeric abnormalities automatically programmed into the data the pervades every aspect of our modern world. Looks a data patterns that have concerning consequences for women and discusses how programming often prioritizes men's needs, neglecting important data that could be used for women's safety, health, and recreation.

Introduction : The default male -- Part I. Daily life. Can snow-clearing be sexist? ; Gender neutral with urinals -- Part II. The workplace. The long Friday ; The myth of meritocracy ; The Henry Higgins effect ; Being worth less than a shoe -- Part III. Design. The plough hypothesis ; One-size-fits-men ; A sea of dudes -- Part IV. Going to the doctor. The drugs don't work ; Yentl syndrome -- Part V. Public life. A costless resource to exploit ; From purse to wallet ; Women's rights are human rights -- Part VI. When it goes wrong. Who will rebuild? ; It's not the disaster that kills you.