[MadSudaca]

Look at the letters you just typed. They're an incredibly efficient information transmission technology. By making the minimal energy expenditure of moving your fingers across the keyboard you're able to convey so much of your current emotional state and ideas in your head. While people thousands of year back only had the stone and who knows what other tools to do the same, but at the much larger cost of carving stone, and only with a minimum of effectiveness in conveying their emotional state, which for us, will forever remain unknown.