Explanation

• Time Period: 3300 BCE – 1300 BCE (entire civilization)
• Mature Phase: 2600–1900 BCE
• Major Cities with Drainage: Mohenjo-daro, Harappa, Dholavira, Lothal, Kalibangan
• Number of Main Drains in Mohenjo-daro: Over 700 household drains connected to covered sewers
• Population Estimate: Around 1–2 million people in urban centers

Last verified on 18-01-2026

Explanation

• The common ostrich (Struthio camelus) is the biggest bird in the world.
• It is weighing up to 344 pounds (157 kilograms) and standing 9 feet tall.
• Female ostriches lay the largest eggs of any living bird.
  

• The world’s fastest bird is the peregrine falcon.
• The white bellbird is the world’s loudest bird.

 Last updated on 12 NOV 2026

Explanation

• Artist: Vincent van Gogh
• Year painted: 1889
• Art style: Post-Impressionism
• Location painted: Saint-Rémy-de-Provence, France
• Current location: Museum of Modern Art, New York

Last verified on 10-06-2026

Explanation

• Country: China
• First use: 806 AD (approx.)
• Early name: Feiqian (Flying Money)
• Dynasty: Tang Dynasty → Song Dynasty (official issue)
• Importance: First-ever paper-based monetary system

Last updated by NA on 05-11-2026

Explanation

• Wilhelm Conrad Rontgen discovered X-rays
• He was discovered on 8 November 1895.
• He got the Nobel Prize in Physics in 1901.

Additional questions

• The penetrating power of X-rays depends on their frequency

Last updated by NA on 05-11-2026

Explanation

• Largest Desert Overall: Antarctic Desert (~14.2 million sq. km)
• Type: Polar ice and tundra (cold desert)

Additional information

• Second Largest Desert: Arctic Desert (~13.9 million sq. km)
• Largest Hot Desert: Sahara Desert (~9.2 million sq. km)

Last updated: 27 OCT 2026 

Explanation

• Coldest continent: Antarctica
• Coldest place recorded: Vostok Station, Antarctica
• Lowest recorded temperature: −89.2°C (21 July 1983)

The coldest place on Earth is:

1) Eastern Antarctic Plateau, Antarctica (-94°C)

2) Vostok Station, Antarctica (-89.2°C) 

3) Amundsen-Scott Station, Antarctica (-82.8°C)

4) Denali, Alaska, United States of America (-73°C)

5) Klinck station, Greenland (-69.6°C) 

6) Oymyakon, Siberia, Russia (-67.7°C)

• The coldest capital city in the world IS Ulaanbaatar
• The coldest region in the atmosphere is the mesosphere

Last updated: 27 OCT 2026 

Explanation

• First successful personal computer: Altair 8800
• Developed by: MITS
• Introduced in: 1975
• IBM PC launched: 1981

Last updated on 26 Oct 2026

Explanation

• Wang Yaping became the first Chinese woman to perform a spacewalk on 7 November 2021.
• She conducted the spacewalk during the Shenzhou-13 mission aboard China’s Tiangong Space Station.
• She was the second Chinese woman to travel into space, flying aboard Shenzhou-10 in 2013.

Last verified on 22-10-2026

Explanation

• The United States conducted the world’s first nuclear test, code-named Trinity, on 16 July 1945.
• The test took place in the Jornada del Muerto desert in New Mexico, USA.
• The experiment was part of the Manhattan Project, a secret American-led programme to develop atomic weapons during World War II.

Additional information:

• Soviet Union: 1949
• United Kingdom: 1952
• China: 1964

Last verified on 22-10-2026