Other contributors have said "What did Edward Binney and harald Smith invent?" is the same question as "What did Harold Smith and Edward Binney invent?" If you believe that these are not asking the same thing and should be answered differently, click here
Edwind Binney and Harold Smith made crayons because they saw how the children had to use sticky chalk and the chalk get over there clothing and hand. So they decide to improve it and made crayons.