[ He might not laugh per se, but the dramatic performance does pull his mouth into a quietly amused smirk. He puts on the duplicated pair to test them- finding that the prescription is exactly how it should be, the lenses are still properly polarized to protect him from visual petrefactors. He'd think they were the same pair if he wasn't tucking them into his lapel pocket. ]

Thanks. I'll try to live long enough to make that second born. [ The smirk rises a little higher for a second, then sinks at a reminder of... something. He quickly reverts back to the mild-mannered scientist before too much of that emotion cracks through, tamping it down under polite stoicism.] Beyond living or decaying matter, are there any other limitations like size or frequency that you use it? [ Curiosity is an excellent way to avoid other feelings. ]