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)

Explanation

• The first artificial satellite in the world was Sputnik 1
• Launch Date: October 4, 1957
• Country: Soviet Union (USSR)
• Size: 58 centimeters (22.8 inches) in diameter
• Weight: 83.6 kilograms (183.9 pounds)
• Mission Life: Transmitted radio beeps for 3 weeks before batteries died; burned up in the atmosphere on January 4, 1958.

Last updated 07-09-2026 by NA

Explanation

• Name: Cheetah (Acinonyx jubatus)
• Top speed: ~109–120 km/h
• Acceleration: Can go 0 to 100 km/h in just a few seconds
• Habitat: Africa & parts of Iran
• Type: Carnivorous mammal

Additional information:

• The three-toed sloth is widely recognized as the slowest mammal on Earth.

Last verified on 23-06-2026

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 verified on 01-07-2026