Hand development is shaped by evolution, biology and environment. Cunaplus_M.Faba/iStock via Getty Images Plus Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Why are our fingers different lengths? – Betty, age 8, California It was one of those rushed mornings when I was already running late for work. In my hurry to grab my keys and head out the door, I knocked a few things off the counter,