Unlike the word processing programs (let’s just lump Excel and Powerpoint in here for argument’s sake too) you use to finalize reports, write memos and tally sales, real life doesn’t have an undo button. You might be able to ctrl+z your way into that promotion, but it won’t unsend an email or unsign important documents. The same thing goes for writing/drafting/note-taking/etc. when it comes to your tool of choice. If you know it’s going to be permanent and you’re never going to change it, write it in pen. If it might need modifying, use a pencil because it’s one of the few things that has an undo option. But don’t use any pencil, pick up something like this Midori Brass Pencil. One half is a refillable HB pencil and the other is a handle that doubles as an eraser. When your powers combine them, it resembles a bullet with a pocket clip. Leave it to the Japanese to make even a pencil look menacing.