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www.reference.com/article/make-potato-clock-8f25b01c03e6c6de

To make a potato clock, connect two potatoes to a low-voltage LED digital clock with copper wire, galvanized nails and alligator clips. This easy chemistry project demonstrates the concept of electrochemical cells, in which chemical energy is converted to electrical energy.

www.reference.com/article/many-types-potatoes-1afc17262b6f11d2

According to The United States Potato Board, seven types of potatoes are commonly enjoyed by consumers: russet, long white, round white, fingerlings, red, yellow and blue or purple. The potato industry refers to them as table-stock varieties.

www.reference.com/article/potatoes-good-b1543e15905ad520

While the George Mateljan Foundation for the World's Healthiest Foods considers potatoes an excellent source of vitamin B6, potassium, copper, vitamin C, manganese, phosphorus, niacin, dietary fiber and pantothenic acid, it cautions that most people eat potatoes deep fried with extra fat, which is u

www.reference.com/article/clocks-change-b8b6a58ae514e2ee

The clocks change due to Daylight Saving Time, which starts on the second Sunday in March and ends on the first Sunday in November, as of 2014. People in participating states and territories change their clocks at 2 a.m. on these days.

www.reference.com/article/clock-system-b1dc6e99a15cc150

A clock system, or clock network, refers to a fully synchronized network of clocks in constant communication with each other and in which each clock displays precisely the same time as all the others within the system. Although clock networks are commonly employed as synchronized timekeepers in scho

www.reference.com/article/history-clocks-839d23a4ecf04c14

The history of clocks includes timekeeping and sundials established thousands of years ago by ancient civilizations, water clocks in the second century B.C. and the tower clock in the 11th century A.D. Europeans built the first mechanical clock in the 1200s and the first wristwatch in the 1500s.

www.reference.com/article/did-potatoes-originate-bf42c67e5e1d114b

Potatoes were first eaten and cultivated in the Andean highlands of South America, between Bolivia and Peru. Spread to Europe and North America by Spanish explorers, these tubers are ranked second among the world's most staple crops.

www.reference.com/article/national-time-clock-358ef2ecad42b046

The national time clock for the United states is the clock that is used to measure the time used as the country's standard time. It is known as the Master Clock and is maintained by the United States Naval Observatory, which continuously displays the current time on its website.

www.reference.com/article/death-clock-df3f2ee8372253d5

A death clock is a life expectancy calculator. Some of the factors considered in the calculation are age, gender, geographic location, amount of tobacco and alcohol consumed, emotional outlook, and body mass index.

www.reference.com/article/potatoes-bad-e6582608711704d4

Potatoes do eventually go bad. Their exact shelf life depends on the type of potato, but most go bad after two to five weeks at room temperature or two to four months in a refrigerator.