Answer to August 2009 Newsletter Brain Teaser:

You must pay with: A 10-dollar bill, a 5-dollar bill, a 2 dollar bill, a New Jersey 25 cent piece, a South Dakota 25 Cent piece, and a Lincoln Penny dated 1959 or later.

All of these forms of tender feature a picture of the same person on the front and reverse.

1) The 10-dollar bill features Alexander Hamilton on the front and the U.S. Treasury on the reverse. Erected in front of the Treasury, and visible on the reverse of the bill, is a statue of Alexander Hamilton.

2) The 5-dollar bill features Abraham Lincoln on the front and the Lincoln Memorial on the reverse, the statue of Lincoln can be seen seated inside the memorial.

3) The 2-dollar bill features Thomas Jefferson on the front and John Trumbull's "Declaration of Independence" on the reverse. Thomas Jefferson is shown standing at the table in this painting.

4) The New Jersey 25-cent piece features George Washington on the front and the individual state's design on the reverse. New Jersey selected the crossing of the Delaware River. George Washington can be seen in his famous pose at the prow of his boat.

5) The South Dakota 25-cent piece also features George Washington on the front. South Dakota elected to include a representation of Mount Rushmore on the reverse. Washington is clearly seen on the far left.

6) The penny, like the 5-dollar bill, features Lincoln on the front and the Lincoln Memorial on the reverse. In a stunning attention to detail, the statue of Lincoln can still be seen on the coin.

The hint refers to Castor and Pollux, the twin stars of the constellation "Gemini". Their last name, "Janus", is also the name of a Roman deity known for having 2 faces...hence twins (same person) and two faces (both sides).