A pencil eraser (Alexis Madrigal). It's true, as Arthur C. Clarke said, that the most advanced technologies are indistinguishable from magic. It's not true, however, that the world's most magical ...

Of course there's a day for everything. Many days on the calendar, in fact, are used to celebrate more than one "milestone." But I must admit my dismay when I found out that April 15 not only is Tax ...