Some children in the United States are learning with help from AI-powered apps at school.
Teenagers affected by Australia’s under-16 social media ban showed the BBC what happened when they tried to access their accounts.
The central bank says US stock price valuations are their most stretched since the dotcom bubble burst.
The app, which was criticised at launch for its $11.99 (£9) a month fee, will close on 31 December.