Neurons communicate with each other via electrical events called 'action potentials' and chemical neurotransmitters. At the junction between two neurons (synapse), an action potential causes neuron A to release a chemical neurotransmitter.
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As a musical style, psychedelic rock attempts to replicate the effects of and enhance the mind-altering experiences of hallucinogenic drugs, incorporating new electronic sound effects and recording effects, extended solos, and improvisation.
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The period of the 3rd, the 2nd, and the 1st millennia bce was a time of drastic change in Europe. This has traditionally been defined as the Metal Ages, which may be further divided into stages, of approximate dates as shown: the Bronze Age (2300–700 bce) and the Iron Age (700–1 bce), which followed a less distinctly defined Copper Age (c. 3200–2300 bce). At this time, societies in Europe began consciously to produce metals. Simultaneous with these technological innovations were changes in settlement organization, ritual life, and the interaction between the different societies in Europe. These developments and their remarkable reflections in the material culture make the period appear as a series of dramatic changes.
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I think you mean who played the Joker. In "Suicide Squad" it was Jared Leto. In "The Dark Knight Rises" it was Heath Ledger. Hope this helps.