Explanation

• The United States is the world's largest crude oil-producing country.

Additional information:

• United States – 18.60 million barrels/day (mb/d)
• Saudi Arabia – 11.01 mb/d
• Russia – 10.50 mb/d
• Canada – 5.29 mb/d
• Iraq – 4–5 mb/d

Last updated 25-07-2026 by NA

Explanation

• China has the world's biggest army by active military personnel.

Additional information:

Top Militaries by Active Personnel (2025 estimates): 

1. China: ~2.035 million
2. India: ~1.46 - 1.475 million
3. United States: ~1.3 - 1.4 million
4. North Korea: ~1.28 million
5. Russia: ~1.1 - 1.3 million

Explanation

• The first ISS module was launched in 1998
• Module Name: Zarya (meaning "sunrise" in Russian).
• Launched on November 20, 1998
• Launch Vehicle: Russian Proton rocket.
• Launch Site: Baikonur Cosmodrome in Kazakhstan.
• Built by a partnership of 15 nations, including NASA (the United States)

Explanation

• First Polio Vaccine Introduced: 1955
• Developer: Dr. Jonas Salk
• Type: Inactivated Polio Vaccine (IPV)
• Oral Polio Vaccine (OPV): 1961
• Developer of OPV: Dr. Albert Sabin

Last verified on 20-07-2026

Explanation

• The Tibetan Plateau is the highest and largest plateau on Earth.
• It is known as "the roof of the world".
• It's located in Southwest China.
• The height of the Plateau ranges is 16,000 feet.
• It is an example of an inter-mountainous Plateau (formed between mountains).

Additional information:

• Solfatara is the smallest plateau.
• This plateau is only 127.66 sq K or 79.15 sq mi (2).

Last verified on 26-05-2026