rtokens: 1930 - Belgian King Baudouin I born .
pos: NNP NN WP VBD DT CD NNS IN NN VBG DT NN TO WDT PRP VBD PRP$ NN .
tokens: U.S. physicist who discovered the two zones of radiation encircling the earth to which he gave his name .
ltokens: 1914 - James Alfred Van Allen born .