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.
Radon for Children. Harmful Effects of Radon. Radon is the second leading cause of lung cancer (diagram to the right) and a serious public health concern. The primary adverse health effect associated with chronic exposure to radon is lung cancer (typically bronchogenic): -squamous cell carcinoma. -small cell carcinoma.
But long term exposure can cause lung cancer, which starts with coughing, coughing up blood, lung pain, breath shortness and more. +1 vote! Radon exposure has many of the characteristics of lung cancer such as a prolonged cough that doesn't get better, coughing up blood, chest pain and wheezing. Prolonged high radon exposure can actually lead to lung cancer.