( ( ( The ( alleged truth ) ) ( of ( a ( scientific statement ) ) ) ) ( always ( ( makes ( ( false ( certain ( other ( scientific statements ) ) ) ) ( which ( ( could possibly ) ( have ( been true ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (VBN alleged) (NN truth)) (PP (IN of) (NP (DT a) (JJ scientific) (NN statement)))) (ADVP (RB always)) (VP (VBZ makes) (NP (NP (JJ false) (JJ certain) (JJ other) (JJ scientific) (NNS statements)) (SBAR (WHNP (WDT which)) (S (VP (MD could) (ADVP (RB possibly)) (VP (VB have) (VP (VBN been) (ADJP (JJ true))))))))) (. .)))
The alleged truth of a scientific statement always makes false certain other scientific statements which could possibly have been true.
(ROOT (S (NP (NP (DT A) (NN statement)) (SBAR (WHNP (WDT that)) (S (VP (VBZ describes) (SBAR (WHNP (WP what)) (S (ADVP (RB always)) (VP (VBZ happens) (PP (IN under) (NP (NP (JJ certain) (NNS conditions)) (PP (IN in) (NP (NN nature)))))))))))) (VP (VBZ is) (ADVP (RB also)) (VP (VBN known) (PP (IN as) (NP (JJ scientific) (NN law))))) (. .)))