Great vision and creativity, and the execution is already at a high level.

There's just one issue: browsing and switching between different products is a bit choppy. This might be due to a low frame rate, so I recommend looking into that for some optimization.

The idea is interesting, but generally, I'd still prefer that children don't use too many electronic devices. The real physical world is better..

how does it handle questions where the document doesn't contain an answer?

it would say it isn't able to find a match in any of the passages for your question.