Explanation

 The Hudson River is a 315-mile (507 km) river

That mostly flows through eastern New York in the United States from north to south.

Explanation

The three countries that have not signed the CTBT are:

• India
• North Korea
• Pakistan

These countries are also among the eight Annex 2 states that have not ratified the treaty.

 The United States was the first nation to sign the treaty.

Signatories:187

Ratifiers: 178

Additional information 

CTBT stands for Comprehensive Nuclear-Test-Ban Treaty 

It's a multilateral treaty to ban nuclear weapons test explosions for both civilian and military purposes

Signed: 24 September 1996

Languages (6)

1. Arabic
2. Chinese
3. English
4. French
5. Russian
6. Spanish

Explanation

The Pentagon is a large, five-sided building in Arlington, Virginia.

They serve as the headquarters for the United States Department of Defense.

It's a prominent symbol of the U.S. military.

"Pentagon" is often used metonymically to refer to the Department of Defense. 

Explanation

The Beijing-Hangzhou Grand Canal is the longest and oldest canal in the world.

Explanation

Explanation

Explanation

Akosombo Dam completed in 1965.

Its construction was jointly financed by the government of Ghana, the World Bank, the USA, and the UK.

Explanation

Explanation

Capital: London & Currency: Pound sterling

Explanation

 The first handheld mobile phone was demonstrated by Martin Cooper on 3 April 1973,

Using a handset weighing c. 2 kilograms (4.4 lbs).

In 1979, Nippon Telegraph and Telephone (NTT) launched the world's first cellular network in Japan.