First, the bad news: Divers stole a prehistoric human skeleton from an underwater cavern near Tulúm on Mexico's Yucatán Peninsula five years ago. Stinnesbeck and his colleagues first became aware of the skeleton in a submerged cave called Chan Hol in February 2012 from photos on social media.
By analyzing what's left of this ice age grave site, researchers determined that the skeleton could be up to 13,000 years old, making it "one of the oldest human skeletons from America," study author Wolfgang Stinnesbeck, an earth scientist at Heidelberg University in Germany, said in a statement.
The reports can be done as Power Point presentations, desktop published articles, or posters with accompanying essays.
Student work should draw upon a variety of contemporary and current sources—including newspapers and periodicals, government documents, personal memoirs, etc.
Unfortunately, 90 percent of the skeleton was looted a month later.
They also can find a wealth of books on the historical and scientific aspects of the discovery of radioactivity and the splitting of the atom.
To summarize and assess student understanding of the ideas in the central benchmarks, have students put the events surrounding the splitting of the atom into a story map in which students generate a map of its events and ideas.
As an alternative, the researchers looked at the relative levels of uranium and thorium isotopes in the stalagmite growing on top of the bone.
Those results showed a minimum age of 11,300 years.