Sudden Short Story 100

The last fully-human specimen was a curious thing.  His eyes could only see in the visible spectrum, and his neurons weren't even enveloped in chitin for their protection.  Human hybrids, of course, varied considerably, and had many improvements, even when they weren't augmentations, but the last fully-human was just that.  He was so old, in fact, that his mind had to be kept intact with a time-wheel, where causation made itself neatly circular over several millennia - long enough for him to forget each event some amount before he encountered it again.