Use of research animals falls 50% since 1968.
D032761:Animal Experimentation; D000827:Animal Welfare; D000818:Animals; D035082:Federal Government; D006076:Government; D033161:Government Regulation; D010146:Pain; D011057:Politics; D012926:Social Control, Formal; D013223:Statistics as Topic; D014481:United States
Biomedical and Behavioral Research; Empirical Approach; Popular Approach/Source