Before 1955, ages for the Earth based on uranium/thorium/lead ratios were generally about a billion years younger than the currently popular 4.5 billion years. old Earth is reviewed and deficiencies of the uranium/lead method are discussed.The basic theory of radiometric dating is briefly reviewed.
As the name implies, relative dating can tell which of the two artifacts is older.
Physical anthropology is concerned with the biological aspects of human beings.
In trying to learn about racial differences, human origins, and evolution, the physical anthropologist studies fossil remains and observes the behavior of other primates.
magazine has been continuously published since 1978, we are publishing some of the articles from the archives for historical interest, such as this.
For teaching and sharing purposes, readers are advised to supplement these historic articles with more up-to-date ones suggested in the Related Articles and Further Reading below.