Bøger af Debbie Loren Dunn

The fascinating true story of groundbreaking chemist William Perkin, who used the scientific method to invent a new way for creating the color purple.Many years ago, the color purple was available only to a privileged few. Making purple was tricky. The dye was concocted from a certain snail, and later, from plants, bugs, and rocks. Then it had to be soaked in minerals and . . . urine! The process was very complicated and expensive (not to mention smelly!).Until 1856, when a boy named William Henry Perkin invented a new way. While testing a hypothesis about a cure for malaria, he found that his experiment resulted in something else -- something vivid and rare for the times: synthetic PURPLE. Perkin, a pioneer of the modern scientific method, made numerous advances possible, including canned food and chemotherapy. But it was his creation of purple that started it all.Authors Tami Lewis Brown and Debbie Loren Dunn craft a compelling tale, and Francesca Sanna''s dynamic art is a joyous celebration of Perkin''s impactful purple.

Click. Whir. Buzz.Not so long ago, math problems had to be solved with pencil and paper, mail delivered by postman, and files were stored in paper folders and metal cabinets. But three women, Betty Snyder, Jean Jennings, and Kay McNulty knew there could be a better way. During World War II, people hoped ENIAC (Electronic Numerical Integrator and Computer), one of the earliest computers, could help with the war effort. With little guidance, no instructions, and barely any access to the machine itself, Betty, Jean, and Kay used mathematics, electrical engineering, logic, and common sense to command a computer as large as a room and create the modern world. The machine was like Betty, requiring outside-the-box thinking, like Jean, persistent and consistent, and like Kay, no mistakes, every answer perfect. Today computers are all around us, performing every conceivable task, thanks, in large part, to Betty, Jean, and Kay's pioneering work. INSTRUCTIONS NOT INCLUDED is their story.This fascinating chapter in history is brought to life with vivid prose by Tami Lewis Brown and Debbie Loren Dunn and with striking illustrations by Chelsea Beck. Detailed back matter including historical photos provides a closer look.