Vocabulary words from the article 

1) rationale
2) propensity
3) optimal
4) debunked
5) cited
6) impair
7) deprived
8) consistency
9) detrimental
10) root
11) determined
12) immune

In your groups, find: the definition of four words on www.dictionary.com (put it in your words) and one synonym from www.thesaurus.com