Raw eggs keep a lot longer. Interestingly, hard-boiled eggs do not keep nearly as long as raw eggs, which can last three to five weeks in the refrigerator. There is a good reason for this. When a hen lays an egg, it puts a naturally protective coating on the outside of the shell.
As of June 2014, the United States Postal Service states that the cost to send a standard sized postcard is 34 cents. At this rate, the postcard can be 6 inches long, 4 1/4 inches high and 0.16 inches thick.
Larger postcards, such as a 6 x 9 postcard, require a 47 cent stamp, but when you mail more than 5,000 postcards, the Standard Mail Presort rate is only 26 - 32 cents per postcard (exact rates depend on the addresses contained in the list) saving you 19 cents or more in postcard postage per piece!