The Seattle longitudinal study of cognitive development discovered that among older people (d.) higher socioeconomic status is associated with higher levels of intellectual functioning. Interacting socially and economically is a great factor in keeping up your intelligence up to date.
If I'm not wrong it's electric because without electricity many advancements wouldn't have been possible like for example; trains, light, radio etc; hoped it helped!
The Power of the Dog just trust me. ∧·∧
One of the main ways in which the policies of Gorbachev, Yeltsin, and Putin were similar is that they all sought to avoid nuclear war with the west--knowing that engaging in such a conflict would no doubt lead to their utter destruction.