Mathematicians duel by competing in solving equations, is best represented in simple, sketch-like il...

In ancient times, people counted using fingers, stones, knots, and the like, giving rise to natural ...

Lily stands by the window, her cheeks aglow with the moonlight. The curtains are partially drawn, al...

Four-year-old Lily stands by the window, bathed in moonlight. The curtains are partly open, showing ...