User talk:YIFAN ZHAO/TWA

A riddle
I ponder a riddle for the few with clue, how do we know what on Wikipedia is true? --SocraTease (talk)

Reliable sources
Hi ! I put this information on the Earth article talk page. It's some sources I found. Which one should we use? I'm so glad you're still with me on this. We rock! --GaiaGirl86 (talk)