¿Cómo podemos ayudar?

Harry Song😀

Actividad reciente de Harry Song😀

What is a practice task?
1. Comunidad
2. General Khan Academy Questions
One of the moon badges in Khan Academy says: Finish 5 practice tasks in a week. I don't know how to find practice tasks. Please help!
Why do others have badges that don't show up in my account?
1. Comunidad
2. Technical Issues and Workarounds
I answered 42 answers correctly and fast, I didn't got the "sub-light speed". When I searched for the badge in my account, I can't find the badge. Please help.