Hacker News Reader

Comment by krackers | Hacker News Reader

>He often needs to ask people to smell him during the day, which leads to some hilarious situations sometimes

Smell and taste seem to be the last two senses/modalities we can't really work with using technology. Vision (cameras) and sound (microphones) have existed for a long time but it's only within the last decade that they've become ubiquitous in the form of a smartphone, and only within the last 5 years that ML is good enough to work across them (ocr, stt).

But for some reason (maybe lack of easy commercial opportunities) we haven't even come close to making "artificial noses" to record raw input. Maybe as part of the push for "embodied humanoid AI" (e.g. Figure) we'll find a way to do that.

View on HN

Two notes on this - one is that smell and taste are the earliest senses we have. The first thing organisms began to sense about their external environments were chemical gradients, and that’s in essence what smell and taste are doing.

The second is that what they’re doing is _fantastically_ complex from a physical standpoint compared to sight and vision - sight is the detection of photons of various wavelengths and energy levels; hearing is the detection of vibrations. Smell and taste are molecular docking problems: they are the detection and identification of the actual structures (or at least substructures) of molecules. The closest we have to that is mass spectrometry, which basically involves flinging molecules hard enough to break them and weighing the parts.

Both good points, thank you! I hadn't appreciated how complex it was, reframing it as something closer to spectometry makes the difficulty clearer.

Ironic, since they are the oldest senses. The very most primitive cells can do chemotaxis, which eventually evolved into the chemical senses. But it also means sensing chemicals instead of energy, and it's harder to replicate mechanically.

Perfumes have existed for centuries. Lots of "apple flavoured candy" which doesn't actually have any apple. Bacon-flavoured vegan food.

There's plenty of examples, both from recent decades and centuries ago.

OP seems to talk about smell sensor (as camera and microphones), not sentences (as paint and guitar)

Reply on news.ycombinator.com