Explanation

• Ole Rømer was the first person to experimentally demonstrate that light has a finite speed in 1676.
• He used observations of Jupiter’s moon Io to estimate the speed of light.

Additional information:

• The modern accepted speed of light in vacuum is 299,792,458 m/s.

Last verified on 07-10-2026

Explanation

• Maldives is the smallest Muslim-majority country in the world by land area.

5 Smallest Muslim-Majority Countries by Area:

• Maldives — ~300 km²
• Bahrain — ~786 km²
• Comoros — ~1,861 km²
• Brunei — ~5,765 km²
• Palestine — ~6,020 km²

Additional information:

5 Largest Muslim-Majority Countries by Area:

1. Indonesia — ~1.90 million km²
2. Kazakhstan — ~2.72 million km²
3. Algeria — ~2.38 million km²
4. Sudan — ~1.89 million km²
5. Libya — ~1.76 million km²

Last verified on 06-10-2026

Explanation

• Brain Virus was created in 1986.
• It was created by Pakistani brothers Basit Farooq Alvi and Amjad Farooq Alvi.
• They were from Lahore, Pakistan.
• It is considered one of the first computer viruses for MS-DOS.

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 26-07-2026 by NA

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)