A nautical mile is equivalent to 1.1515 miles on land. A knot is the measure of speed on water. One knot is 1 nautical mile per hour.

According to international definition, fog occurs when visibility is 600 feet or less. Visibility in mist may extend up to 3,000 feet.

It's a myth that lightning never strikes the same place twice. The Empire State Building and the Eiffel Tower are struck on average twenty to thirty times a year because lightning usually seeks out the highest object.