There are all kinds of gemstones: Diamonds, rubies, emeralds, sapphires, and opals
are a few examples of gemstones. Diamonds are a girl's best friend.
Natural diamonds are made deep in the Earth, but their are also artificial diamonds.
Clocks, sundials, timers, and watches.
All of these devices measure the passage of time.
Stopwatches are used to measure and record the timing of an event.
Wristwatches are small clocks that people wear on their wrist.
Quartz timepieces are very accurate.
Devices for generating an electric current by means of a chemical reaction are called batteries.
Batteries come in all sorts of shapes and sizes, and deliver various voltages and amperages.
Some batteries are rechargeable, while others are intended for a single duty cycle,
and are discarded once they are dead. Some people are concerned by chemical pollution brought
on by dead batteries discarded in landfills. Sometimes a battery is of a variety that can
be charged up again and reused to power an electric device. There are wet batteries as well as
dry cell batteries which have some moisture actually. Batteries should not be discarded in a fire.
Refridgerators as well as other major appliances keep our civilization humming along.
A refridgerator is an apparatus for reducing and maintaining the temperature of a
chamber below the temperature of the external environment. Most American households
have a kitchen refridgerator for storing food and drink that needs to be kept cold.
To preserve food by chilling is to refridgerate.
