Fascinating. Above average memory related abilities have always intrigued me. I often have flash backs to forgotten events I have not thought about in years (some good, some bad), which come to me suddenly if triggered by a smell or some other fragment of a thought*. It's all up there, somewhere, the key is just to unlocking it. As for this story, while they seem to remember alot, I am not sure if they just remember key facts about each moment, rather than that moment in every last detail. I'd once read a NY Times SCIENCE SECTION article that stated if you remembered everything -- literally EVERYTHING-- , in every perfect detail (down to how each hair on your head felt blowing in the breeze as you rode in the car) from the moment you woke up to the time you got to work in the morning, you'd have run out of memory and your brain would be unable to form new memories
*For example, last year I drank an IZZE CLEMENTINE SPARKLING SODA for the first time, and as the scent hit my nose I immediately was transported to being seven years old standing outside LAX with my dad, after having just touched down in California, waiting for an uncle to meet us. I remembered the potted palm trees, and drinking an orange drink
A single scent was able to trigger all that, after I'd probably not spent a single second thinking about it since the first few weeks after I got back from that trip, all those years ago (good memory BTW)