Sorry - as the IBM Cloud outage continues and worsens, it's knocking more parts of Machine Learning for Kids over. The most recent is the PostgreSQL database that I use to store all site data (including the temporary session data when you click "Try it now") which is now unavailable.
I'm afraid until
https://cloud.ibm.com recovers, I'm locked out from doing anything... I can't even log into the cloud space where the site is hosted to add any new messages or put the site into a maintenance mode.
I'm really sorry about this... today has been a rough day
D