The Oregon and California coast is so treacherous that the mouth of the Columbia River was known as "The Graveyard of the Pacific." Many sailors lost their lives when their ships suddenly ran upon ragged rocks in stormy weater. What did people do to keep ships and their crews safe from a shipwreck death?
In the 1920s only daring people flew planes, trying to set records for the longest distance, around the world flights, or crossing the continent. The United States Postal Serice had another idea for cross-country flying. It wanted to send mail coast to coast, faster than it could by rail. But that was dangerous-it was hard for pilots to tell where they were and they couldn't fly at night. How did the Postal Service solve this problem?
Use the "History Mystery Examiner" and this web site to crack the case.