I asked "What is taller, a dog or a giraffe?" and it didn't know. Common sense is not yet in the knowledge graph. Maybe it can't perform comparisons

Also: "What is the largest city in Europe?" -> "New York City".

"What is the largest city in the world?" -> "Gotham City"

So it seems to make KB lookup errors and probably can't do logic/set operations.

Correct, we can't do logic/set operations yet, but we can handle some graph traversal questions where the answer is the property of a n-off related entity like: (1) "Who is Arya Stark's father's wife?" or (2) "Mark Zuckerberg's wife's birthday"

I also tried things like:

How old is the French Prime-Minister? How old is the Portuguese President?

President always defaults to Trump and Prime-Minister to May (May also responds with two different results even though it show the same text(/source?). Also in Sapien "Prime-Minister" wasn't recognized.

I'm very excited about technologies like this one.

Yes, this is definitely a class of questions we don't do right now, but have updates coming for soon!

Good catch on "Prime-Minister", we will patch that.

Right now we think of Cortex as a competitor to Google KnowledgeGraph and WolframAlpha, rather than a common sense knowledge graph. But, we hope to answer questions like that one day :)

Thanks for pointing this out - we didn't know about this case and it's cool to see Cortex can answer it correctly! For data sources right now, we use Wikipedia for Cortex but we're planning to add additional ones soon to handle more questions (e.g. questions around movies, restaurants, etc.).

There are definitely some questions (e.g. earth age) that we aren't as good at right now, but we're improving those!

It's definitely impressive. However it still fails at questions like "How old is the Earth".

Thanks for checking it out! There are definitely question domains that need work and some overfitting problems but we wanted to get this out to HN community early and see what they thought.

Pretty cool. It answered 'how old is the president' correctly, but got confused with 'how old is the vice president' and gave president Bush's age.

Fun to play with!

> What is the most dangerous bear?

Winnie - The - Pooh

'Oh bother,' said Pooh, triggering the failsafe device. 'They caught on quicker than I expected.'

It scared us as kids :)