Fact typos and formatting

Thanks for the great api! I noticed some small issues though:
1. One of the facts is missing the first letter:
It should be `In ancient China, an emperor's` instead of `n ancient China, an emperor's`
2. There seems to be a mix of straight and curly characters used for apostrophes and speech marks. Ideally curly should be used over straight e.g.
For apostrophes: **'** should be replaced with its curly counterpart **’**
For speech marks: **" "** should be replaced with their curly counterparts **“ ”**
3. This fact seems to be missing some content:
`Puppies then take a year or more to gain the other half of their body weight.`

Search the repository for the quoted fact text and the affected fact data. Review the surrounding entries to identify the missing first letter, apostrophe and quotation-mark formatting, and incomplete puppy-weight sentence. Done means all three reported content corrections are applied consistently.

Written by the indexing model from the issue text.