In 1956, the U.S. state of Connecticut began a severe crackdown on speeding drivers. The following graph shows the annual number of traffic fatalities before and after the crackdown. In what way could this graph be misleading?
All truly wise thoughts have been thought already thousands of times; but to make them truly ours, we must think them over again honestly, till they take root in our personal experience.

Johann Wolfgang von Goethe