Explanation

Olympic Airlines, a Greek airline,

Formerly known as Olympic Airways

It was founded on April 6, 1957

Ceased operations: 29 September 2009 (sold name and logo to Olympic Air)

The airline's head office was located in Athens

Lcarus, the first predecessor airline to Olympic, was established in 1930.

Explanation

The Earth was formed about 4.5 billion years ago.

Additional information:

• Method Used: Radiometric dating
• Oldest Materials: Meteorites and ancient Earth rocks
• Scientific Consensus: Supported by geology and astronomy

Last verified on 16-01-2026

Explanation

• Oceans cover roughly 71% of the Earth’s surface.
  • Land constitutes the remaining 29%, including continents and islands.
  
  
  Additional information:
  • Largest Ocean: Pacific Ocean (~63 million sq. miles)
  • Other Oceans: Atlantic, Indian, Southern, Arctic
  • Oceans store 97% of Earth’s water.

Last verified on 15-01-2026

Explanation

• Definition: Rearing silkworms to produce silk
  • Main Insect: Bombyx mori (mulberry silkworm)
  • Main Food: Mulberry leaves
  • Output: Silk fiber from cocoons
  • Major Producers: China, India, Uzbekistan, Thailand, Vietnam

Last verified on 05-02-2026

Explanation

World Wetlands Day is celebrated on February 2 every year.

This day is an environmentally related celebration.

First celebrated on February 2, 1971.

Theme 2025: Protecting Wetlands for Our Common Future

The 2026 theme is “Wetlands and Traditional Knowledge”

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Explanation

• Sunlight is a good source of vitamin D.
• When our skin is exposed to sunlight, it produces vitamin D, 
• It is essential for bone health, immune function, and the regulation of calcium levels in the blood.
• Deficiency of Vitamin D results in Rickets.

Explanation

• Sound waves are mechanical waves and need a medium to travel.
  • They travel fastest in solids, slower in liquids, and slowest in gases.
  • Solid particles are closely packed, allowing rapid vibration transfer.

Last verified on 04-02-2026

Explanation

Host Country: Japan

Host City: Tokyo

Actual Dates: July 23 – August 8, 2021

Reason for Delay: COVID-19 pandemic 

Additional information:

Last verified on 02-02-2026

Explanation

• A kremlin is found in historic Russian cities. 
• It includes five palaces, four cathedrals.
• It was built between the 14th and 17th centuries.
• Since the 13th century, the Kremlin was the Great Prince's residence.

Additional information:

• The complex now serves as the official residence of the Russian President.
• The name Kremlin means "fortress inside a city".

Last verified on 02-02-2026

Explanation

The current President of France is Emmanuel Macron.

He has been serving as president since 14 May 2017 and was re‑elected in 2022.

Macron is the eighth President of the Fifth Republic of France.

He leads the centrist political movement Renaissance.

Last updated on 25 Jan 2026