Number columns allow you to take large numbers and subtract one from another. Find out more in this Bitesize Primary KS2 Maths guide.

Ada Lovelace, daughter of the famous poet Lord Byron, is considered the world's first computer programmer.

If Windows simply cannot find javaw.exe, you may solve this problem in no time and get back to launching Java programs with ease.

Charles Robinson has been a senior writer for Yahoo Sports since 2004, specializing in NFL and investigative reporting. Follow him on Twitter @CharlesRobinson.