Saline, also known as saline solution, is a mixture of sodium chloride in water and has a number of uses in medicine. Applied to the affected area it is used to clean wounds, help remove contact lenses, and help with dry eyes. By injection into a vein it is used to treat dehydration such as from gastroenteritis and diabetic ketoacidosis. It is also used to dilute other medications to be given by injection.

are sodium chloride and saline the same thing?

A: no

The major railway bridge described in the novel and film didn't actually cross the river known at the time as the Kwai. However, in 1943 a railway bridge was built by Allied POWs over the Mae Klong river -- renamed as a result of the film Khwae Yai in the 1960s -- at Tha Ma Kham, five kilometres from Kanchanaburi, Thailand. Boulle had never been to the bridge. He knew that the railway ran parallel to the Kwae for many miles, and he therefore assumed that it was the Kwae which it crossed just north of Kanchanaburi. This was an incorrect assumption. The destruction of the bridge as depicted in the film is also entirely fictional. In fact, two bridges were built: a temporary wooden bridge and a permanent steel/concrete bridge a few months later. Both bridges were used for two years, until they were destroyed by Allied bombing. The steel bridge was repaired and is still in use today.

is the bridge on the river kwai still there?

A: yes

Voting rights of United States citizens in Puerto Rico, like the voting rights of residents of other United States territories, differ from those of United States citizens in each of the fifty states and the District of Columbia. Residents of Puerto Rico and other U.S. territories do not have voting representation in the United States Congress, and are not entitled to electoral votes for President. The United States Constitution grants congressional voting representation to U.S. states, which Puerto Rico and other U.S. territories are not, specifying that members of Congress shall be elected by direct popular vote and that the President and the Vice President shall be elected by electors chosen by the States.

does puerto rico vote in the us presidential election?

A: no

To maintain lactation, a dairy cow must be bred and produce calves. Depending on market conditions, the cow may be bred with a ''dairy bull'' or a ''beef bull.'' Female calves (heifers) with dairy breeding may be kept as replacement cows for the dairy herd. If a replacement cow turns out to be a substandard producer of milk, she then goes to market and can be slaughtered for beef. Male calves can either be used later as a breeding bull or sold and used for veal or beef. Dairy farmers usually begin breeding or artificially inseminating heifers around 13 months of age. A cow's gestation period is approximately nine months. Newborn calves are removed from their mothers quickly, usually within three days, as the mother/calf bond intensifies over time and delayed separation can cause extreme stress on both cow and calf.

does a cow have to give birth to produce milk?

A:
yes