I changed the former "try-a-question" to TaQ.
Q&A for professional mathematicians
Joined 4 years ago, last seen 19 days ago
Q&A for people studying math at any level and professionals in related fields
Joined 2 years ago, last seen 13 days ago
Q&A for active researchers, academics and students of physics
Joined 10 months ago, last seen 7 months ago