Answer:
The world's first electric traffic signal is put into place on the corner of Euclid Avenue and East 105th Street in Cleveland, Ohio, on August 5, 1914.
it means what does pddh mean
If a child covers his/her ears when seeing fireworks, before hearing the sound of fire works, seeing the fireworks would be a <span>conditioned stimulus. I think it caused that behaviour reaction.</span>
