From my own experience, switching from traditional fountain pens to ballpoint pens has been a game changer, especially because of the oil-based ink innovation that prevents leaks and dries quickly. What many don’t realize is that early ballpoint pens had huge technical challenges. The tiny ball at the tip had to be held precisely—not too tight to avoid clogging, nor too loose to prevent leaking. This level of precision was difficult to achieve, which made early ballpoint pens expensive and less reliable. Laszlo Biro’s key insight was to focus on the ink itself. Early inks were water-based, flowed too easily, dried slowly, and soaked through paper, requiring the pen to be held upright. Changing to a thicker oil-based ink solved these problems by using capillary action to draw ink to the ball, allowing smooth writing at almost any angle without leaks. I appreciated how this meant I could write comfortably whether sitting, standing, or drawing without worrying about ink blotches or pens drying out quickly. The development also influenced everyday writing tools globally, making ballpoint pens affordable and reliable. If you’re like me and value convenience and clean writing, understanding this history helps appreciate the design and technology behind such a simple tool. It’s amazing to think a small change like switching ink formula had such a monumental impact on how we write every day.