Countries with mixed economies include Iceland, Sweden, France, the U.S, the U.K, Cuba, Russia and China. Most industrial countries have mixed economies, but vary in the degree of government involvement. For example, in Western Europe the government generally has a stronger role, while in North America the market is more influential. The only major planned economy is North Korea.
Answer:
The development of antibiotics and immunizations.
Explanation:
I believe the answer is Insomnia
Insomnia is a form of the medical disorder that makes an individual has a difficulty to obtain proper sleep.
The cause of insomnia could vary between each patient, ranging from psychological, diet, or even hormonal.