Investors and financial analysts often rely on the profitability index (PI) to determine whether the benefits of an investment opportunity outweigh its costs. Essentially, the PI compares projected ...

A data storage company has decoded more than 100 trillion digits of pi — smashing the world record for calculating the never-ending number. Unraveling this hefty slice of pi required the equivalent ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...