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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/science/potato-battery-work-514013e6e8d9433e

Potato batteries use the acids in the potato to start a reaction with two electrodes made of different metals that cause electrons to flow from one to the other through the potato, producing power. The potato acts as a salt bridge, connecting the anode, or negative electrode, to the cathode, or posi

www.reference.com/article/can-replacement-battery-clock-65b58fba6d40a89

Klockit.com and ClockParts.com each sell replacement clock batteries. Each retailer sells a variety of replacement batteries and other parts used in clock repair and construction.

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/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/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/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/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/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/stop-clock-game-fb174ba61539fb5b

The Stop the Clock game is a learning activity directed toward second- to third-grade students that uses several clocks to help teach them how to tell time. Each clock is set at different time intervals and each player has a chance to set the clocks at the appropriate time. Once a player is finished