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