1.57% discount on Amazon to users of A9 search engine
Amazon wants to share the "pi", so they're giving half of 3.14, i.e. 1.57% discount to search users.
The A9 engine uses Google in the back end, so it's not a big deal to use it instead of Google.
The A9 engine uses Google in the back end, so it's not a big deal to use it instead of Google.