Function. Plants also have a pH rating. Plants whose pH matches the soil's pH can take up nutrients more efficiently than plants with a pH rating different than the soil. Pine trees and the needles that they produce prefer acidic soil.
Price of a Stamp. The current price of a first class stamp is 49 cents. A domestic first class letter (1 oz.) is 49 cents. The price of each additional ounce is 21 cents. It will cost you 34 cents to send a domestic postcard.
It is worth the current postage for mailing a regular (first class, up to 1oz) letter in the USA. As of 7/7/2009, 44 cents.   The forever stamp is sold at the currentâ¦ rate, but can be used in the future even if rates go up. That's why it's called the forever stamp.