Maps, compasses, astrolabes, and calipers are among the early tools used by ocean navigators. In the modern era, these tools have been largely replaced by electronic and technological equivalents. Despite these early beginnings, it would take many centuries before global navigation at sea became possible.
Harmful Effects of Radon. 1  Radon is the second leading cause of lung cancer (diagram to the right) and a serious public health concern. 2  The primary adverse health effect associated with chronic exposure to radon is lung cancer (typically bronchogenic): -squamous cell carcinoma.
Radon is a colorless, odorless and tasteless gas. You can not see it or smell it. There will not be any immediate radon exposure symptoms, however radon can be doing damage internally due to its radioactive nature. The only way to know if you are being exposed to radon is to do a radon test.