What work can one never finish?

Question

If you take a marker & start from a corner on a cube, what is the maximum number of edges you can trace across if you never trace across the same edge twice, never remove the marker from the cube, & never trace anywhere on the cube, except for the corners & edges ?

Answer 1

An autobiography. Unless you’re writing it in your death bed I suppose, but even then, how will you be able to record the time of death?