1 The sun's rays are strongest during the hours of 10 a.m. to 4 p.m. The sun's rays are also stronger at higher altitudes and lower latitudes (closer to the tropics). Reflection off water, sand, or snow can make the sun's burning rays stronger.  Sun lamps can cause severe sunburn.
Marchantia polymorpha, sometimes known as the common liverwort or umbrella liverwort, is a large liverwort with a wide distribution around the world. It is variable in appearance and has several subspecies.
This article is also available in Spanish. Introduction to The Urantia Book. Not long ago a woman wrote to me about a very painful episode in her life. About fifteen years ago her husband. embarked on a spiritual quest that ultimately destroyed their marriage and family.