If you want to know about the weather, or music, geography, engineering, colours….. the list is long!
from Planet Nutshell.
For further information on WolframAlpha these links may be useful:
Learn to use WolframAlpha for Mathematics on Mathematics for Students.
10 questions younger children could try – Wolfram Alpha Blog entry
From h+ Magazine a comprehensive Users Guide to WolframAlpha
Step-by-Step Math – WolframAlpha blog post
Training Video from Russell Stannard – Teacher Trainng Videos
It is very good at Mathematics! Try the following:
Type in: solve 3x+7 = 13 and then enter.
Note that you have the option to show the steps when the results are returned.