Number Treasury 3
Investigations, Facts and Conjectures About More than 100 Number Families
Written as a resource for both teachers and students, this enlarged third edition of Number Treasury is designed to guide readers through the steps that will help them to think critically, to provide explanations and to formulate conjectures about different families of positive integers. Its 137 exercises and 28 'investigations', at three levels of difficulty, cover such intriguing topics as magic squares, palindromic numbers and twin primes. Detailed solutions are provided at the back of the book.
The Birth of the Pill
How Four Pioneers Reinvented Sex and Launched a Revolution
In the winter of 1950, 71-year-old Margaret Sanger met the scientist Gregory Pincus in New York City. Their meeting would change the world. This gripping account tells how Pincus and Sanger, a lifelong campaigner for women’s right to control their fertility, developed the contraceptive pill, funded by the philanthropist Katharine McCormick and supported by a charismatic Catholic doctor, John Rock, who battled his own church to win public approval for the controversial new drug.