What is the longest escalator in the United States?

The longest continuous escalator in the United States and the Western Hemisphere is located in Washington D.C. It is at the Wheaton station of the Washington D.C. Metro system. It is 230 feet long with a vertical rise of 115 feet. It can take approximately 2 minutes 45 seconds to ascend or descend without walking.

Source: http://en.wikipedia.org/wiki/Wheaton_%28Washington_Metro%29

Why is Tax Day April 15?

Since 1955, Tax day has typically fallen on April 15. If April 15 falls on a Friday, Taxes are due the following Monday. If April 15 falls on a Saturday or Sunday, then taxes are due the following Tuesday due to the observance of Emancipation Day in Washington, DC. Which is why this year taxes are due on April 17.

Source: http://en.wikipedia.org/wiki/Tax_Day