Title: Abacus
Description: Science-loving AP and his older sister Kate find a strange abacus and are whisked off on a time-traveling adventure that lands them in exciting points of British, American and ancient Egyptian history. Pursued by a hooded stranger who wants the abacus, and having to fend off the danger posed by being strangers in strange times, AP must use science to get themselves out of trouble in time, in each time.
Subjects: Science, Experiments, Juvenile literature