Assertion: arsenic | /r/HasProperty | one of them
Facets:
value: over the years
type: TEMPORAL
Source sentences:
text: Also, most toxic chemicals adversely effect the male reproductive system and arsenic is one of them; Chinese research has confirmed it reduces semen quality.  
text: Arsenic is one of those things that’s had a number of uses over the years, and it’s also one of those things that we now know can be deadly.