Block Set Periodic Table of the Elements Toy
- Made in the U.S.A.
- Twenty blocks
- Michigan basswood
- Non-toxic inks
This is probably the only time you should let a child play with plutonium and arsenic. Each colorful block features six element images accompanied by their atomic number, symbol, and name.
Including the letter from Albert Einstein to FDR concerning the possibility of weaponizing atomic energy, the Department of Energy's records from the Lawrence Berkeley National Laboratory Laboratories, and records from the Food and Drug Administration, the National Archives holds in trust many important documents related to scientific research.