Text: Commotio cordis (Latin, ''agitation of the heart'') is an often lethal disruption of heart rhythm that occurs as a result of a blow to the area directly over the heart (the precordial region), at a critical time during the cycle of a heart beat causing cardiac arrest. It is a form of ventricular fibrillation (V-Fib), not mechanical damage to the heart muscle or surrounding organs, and not the result of heart disease. The fatality rate is about 65% even with prompt CPR and defibrillation, and more than 80% without.

Question: can a blow to the chest stop your heart?
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Answer: yes

Text: Silicon Valley (abbreviated as SV) is a region in the southern San Francisco Bay Area of Northern California, referring to the Santa Clara Valley, which serves as the global center for high technology, venture capital, innovation, and social media. San Jose is the Valley's largest city, the 3rd-largest in California, and the 10th-largest in the United States. Other major SV cities include Palo Alto, Santa Clara, Mountain View, and Sunnyvale. The San Jose Metropolitan Area has the third highest GDP per capita in the world (after Zurich, Switzerland and Oslo, Norway), according to the Brookings Institution.

Question: is silicon valley part of the bay area?
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Answer: yes

Text: Conscription was next used after the United States entered World War I in 1917. The first peacetime conscription came with the Selective Training and Service Act of 1940. When World War II ended, so did the draft. It was quickly reinstated with the Korean War and retained for the next 20 years, especially in the Vietnam War. Active conscription (''the draft'') ended in 1973.

Question: is there compulsory military service in the us?
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Answer: no

Text: Metrication (or metrification) is the process of introducing the International System of Units, also known as SI units or the metric system, to replace a jurisdiction's traditional measuring units. Although all U.S. customary units have been redefined in terms of SI units, as of 2018 the United States is one of only seven countries, including Myanmar (Burma), Liberia, Palau, the Marshall Islands, the Federated States of Micronesia, and Samoa that have not officially adopted the metric system as the primary means of weights and measures. However, both Myanmar and Liberia are reportedly essentially metric, even without official legislation in effect, while Palau, Micronesia, and the Marshall Islands are all administered by the United States under the Compact of Free Association.

Question: is the united states on the metric system?
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Answer:
no