That's an extremely broad question, since cents have been issued for over 200 years. There are a number of sub-links to values lists at places such as http://www.coinclub.com/prices/ where you can browse through the large amount of information that's available.
1937 penny
1909-S-vdb, 1914-D, 1931-S and others.
any copper penny is worth more than its face value.
The 1964 Lincoln penny is unfortuantely worth 1 penny. This was not a key date amongst pennies. Most valuable pennies were wheat and Indian head cents dating from 1859-1958
Most likely. They should be evaluated by a professional coin collector and him/her can give you a more detailed evaluation.
In an auction house.
Because people do collect them.
1937 penny
Wheat pennies from the 1940's and 50's are 5-10 cents.
Not really, as there are billions of them already in circulation.
Not any time soon. There are billions of them in circulation.
The sauce has acid in it, which cleans pennies. Keep in mind that a penny that might be rare and valuable has little value if it has been cleaned.
Generally, coins are valuable because of the price of the metals they are made from, but if you mean in a collectible way: One thing that makes a penny valuable is the date. They older the coin usually the more valuable. Another thing is the mintmark. For example 1943 pennies with a "S" mintmark are more valuable than pennies with no mintmark. Another thing is the condition of the coin. The less ware it has the more it's worth.
it depends wheather or not you are interested in them and think they are valuable.
Yes, less than 6 are known.
1909-S-vdb, 1914-D, 1931-S and others.
Indian cents all have some premium above face value. The older large cents are even more valuable.