people visual problem develop quickly purpose began scientific field friend popular knowledge write information researcher improved women separate sentence being quite before politics important environment economy about below muscle earth much study during concern population pronunciation security complained spoken instead clear process draw encourage firms discovered electric opportunity valuable television consistently period student purchased nutrients disturbed proposal nutrition expected progress compromised approaching biology tremendous further executive decision network next recognize responsibility significant structure science involve identify hospital financial evidence democratic possibly synthesize substitute frequently increase campaign capability citizen conflict construct contribute decide curriculum eliminate episode identification industrial junior perceive phenomenon philosophy physician rhythm recruit scenario strength tendency yield