( ( In ( ( the fall ) ( of 1938 ) ) ) ( , ( ( German ( scientists ( Otto ( Hahn ( and ( Fritz Strassman ) ) ) ) ) ) ( ( ( fired neutrons ) ( from ( ( a source ) ( containing ( ( the ( elements ( ( radium and ) beryllium ) ) ) ( into ( uranium ( -LRB- ( ( atomic ( number 92 ) ) -RRB- ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT the) (NN fall)) (PP (IN of) (NP (CD 1938))))) (, ,) (NP (NNP German) (NNP scientists) (NNP Otto) (NNP Hahn) (CC and) (NNP Fritz) (NNP Strassman)) (VP (VBD fired) (NP (NNS neutrons)) (PP (IN from) (NP (NP (DT a) (NN source)) (VP (VBG containing) (NP (NP (DT the) (NNS elements) (NN radium) (CC and) (NN beryllium)) (PP (IN into) (NP (NP (NN uranium)) (PRN (-LRB- -LRB-) (NP (JJ atomic) (NN number) (NN 92)) (-RRB- -RRB-))))))))) (. .)))
In the fall of 1938, German scientists Otto Hahn and Fritz Strassman fired neutrons from a source containing the elements radium and beryllium into uranium (atomic number 92).
(ROOT (S (NP (NP (DT The) (JJ low) (JJ atomic) (NN number)) (PP (IN of) (NP (NN beryllium)))) (VP (VBZ allows) (S (NP (PRP it)) (VP (TO to) (VP (VB absorb) (NP (NNPS x-rays)))))) (. .)))