Toy Fair: Mark My Time digital bookmarks
Rubbery bookmarks that can be set to count up or down to a preset time, they're designed to help track how long a youngster's spent poring over the tomes. There's also a version aimed at music students, which includes a metronome with 5 rhythms. For the grown-ups, Mark-My-Time suggests using it to track workout sessions.
They're available right now for $9 and up at the product page.

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Can we hack it to make a funky watch? Is the bookmark part of the product flexible enough to be a strap?