When was the DC Metro built?

When was the DC Metro built?

The Washington, DC Metrorail system is a regional rapid transit system consisting of five lines, 83 stations and approximately 103 miles of track. System completion as originally planned was achieved on January 13, 2001. Construction began on December 9, 1969, with the first stations opening on March 27, 1976.

How much is 20 pounds of quarters worth?

The first surprise is that a pound of dimes and a pound of quarters are essentially worth the same amount of money, namely $20, a coincidence on two levels that isn’t so well-known.

When was the first regular TV broadcast in the United States?

Profile America — Thursday, May 12th. This week marks the anniversary of the first regularly scheduled television broadcasts — and the date may surprise you. They were made in 1928 and originated from radio station WGY in Schenectady, New York.

What were Johnny Appleseed’s apples really for?

Yes, there was a real John Chapman who planted thousands of apple trees on U.S. soil. But the apples on those trees were much more bitter than the ones you’d find in the supermarket today. “Johnny Appleseed” didn’t expect his fruits to be eaten whole, but rather made into hard apple cider.

When was the first motion picture with sound?

Vitaphone, as this system was now called, was publicly introduced on August 6, 1926, with the premiere of Don Juan; the first feature-length movie to employ a synchronized sound system of any type throughout, its soundtrack contained a musical score and added sound effects, but no recorded dialogue—in other words, it had been staged and shot as a silent film.

How much does the temperature change with altitude?

Although the actual atmospheric lapse rate varies, under normal atmospheric conditions the average atmospheric lapse rate results in a temperature decrease of 6.4C°/km (3.5F°/1,000 ft) of altitude above ground level. The measurable lapse rate is affected by the moisture content of the air (humidity).

How many books did Dr Seuss write before he died?

Between 1937 and 1991, when he died aged 87, he published more than 40 books, which have sold half a billion copies between them – more even than J K Rowling’s Harry Potter books. He nearly burned his first book, And to think that I saw it on Mulberry Street, after it was turned down by 27 publishers.

Who was the first to walk on the moon?

Apollo 11 was the spaceflight that landed the first humans on the Moon, Americans Neil Armstrong and Buzz Aldrin, on July 20, 1969, at 20:18 UTC. Armstrong became the first to step onto the lunar surface six hours later on July 21 at 02:56 UTC.