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They should also understand that the atoms of any element are alike but are different from atoms of other elements.
Atoms may stick together in well-defined molecules or they could be packed together in large arrays.
The second lesson, Radioactive Decay: A Sweet Simulation of Half-life, introduces the idea of half-life.
By the end of the 8th grade, students should know that all matter is made up of atoms, which are far too small to see directly through a microscope.
The origins of the shroud and its images are the subject of intense debate among theologians, historians and researchers.
Diverse arguments have been made in scientific and popular publications claiming to prove that the cloth is the authentic burial shroud of Jesus, based on disciplines ranging from chemistry to biology and medical forensics to optical image analysis.
The details - the direction of the flow of blood from the wounds, the placement of the nails through the wrists rather than the palms - displays a knowledge of crucifixion that seems too accurate to have been that of a medieval artist. Guillermo Gonzalez for sending me the issue of BAR with the Shroud article last November and encouraging me to act on it.Stephen Mattingly - Previously unpublished response to the article "A Letter to Hershel Shanks, Editor of BAR" by Dr.Alan Whanger - Previously unpublished response to the article When the Shroud of Turin went on display this spring for the first time in 20 years, it made the cover of Time magazine with the blurb "Is this Jesus?" In BAR, we summarized the controversy that has enshrouded this relic, venerated for centuries as the burial cloth of Jesus ("Remains to Be Seen," Strata, Julyl August 1998, p 13).