But when people are past a certain age, you sort if stop asking them why they do things. It feels dangerous. What if you say So, Mr Penumbra, why do you want to know about Mr Tyndall's coat buttons? And he pauses, and scratches his chin, and there's an uncomfortable silence-- and we both realize he can't remember?

I am really into the type of girl you can impress with a prototype.

The space is appropriately shoe-boxy and all the shelves are there. I've set them up with a coordinate system, so my program can find aisle 3, shelf 13 all by itself. Simulated light from the simulated windows casts sharp-edged shadows through the simulated store. If this sounds impressive to you, you're over thirty.

You went to Greenland...on purpose," Naz said.