LIKE MY DAD and his dad before him, I carry a notebook in my pocket. Mine is unruled. Dad had spiral binding on his. Grandpa marked his pages with coloured dots. Paper notebooks are the only piece of office mobility that spans the generations in my family. Most of us discard tech well before the end of a generation because product lifetimes are significantly less than a human lifespan. Pen and ink lasted hundreds of years. The typewriter spanned three generations in my family. The personal computer has lasted a single generation. I doubt the touchscreen phone I am using to create this blog post will last a single generation.