# Circadian phenomena -- internal 24-hour clock mechanisms of humans and other living beings currently have no scientific explaination. Examples include how some people are unable to change the timing of their need for sleep for each day, and how plants exhibit clock-like behavior regardless of their exposure to sunlight. In addition, there is a weekly clock cycle for many phenomena, which has a clear biblical basis but defies any materialistic explanation.<ref>http://www.biblestudy.org/godsrest/mysterious-seven-day-cycle-in-plants-animals-man-2.html</ref> | # Circadian phenomena -- internal 24-hour clock mechanisms of humans and other living beings currently have no scientific explaination. Examples include how some people are unable to change the timing of their need for sleep for each day, and how plants exhibit clock-like behavior regardless of their exposure to sunlight. In addition, there is a weekly clock cycle for many phenomena, which has a clear biblical basis but defies any materialistic explanation.<ref>http://www.biblestudy.org/godsrest/mysterious-seven-day-cycle-in-plants-animals-man-2.html</ref> |