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Gunpowder was invented by the Chinese and introduced into Europe in the fourteenth century.
Acetylcholine
A neurotransmitter in both the central and peripheral nervous systems that is involved in many functions including muscle stimulation, memory, and learning.
Dopamine
A neurotransmitter involved in many functions, including motivation, reward, attention, and the regulation of movements.
Serotonin
Serotonin is a neurotransmitter that plays a key role in mood regulation, digestion, sleep, and other bodily functions.
Endorphins
Neurochemicals in the brain that act as natural painkillers and also boost feelings of pleasure or well-being.
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