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Sciences

• Physics (105)
  • What is on the sides of the rainbow?
  • Engine efficiency
  • Magnetic fluid
  • Amber and electricity
  • Wind power plants of Yuri Kondratyuk
• Chemistry (96)
  • Experiments with gases
  • How to make a stearic candle from soap?
  • Chemical clock
  • Experiments with silver
  • How to get artificial fiber
• Biology (114)
  • How to get large roots and vegetables
  • Butter and bread from... trees
  • Do fish drink water?
  • The smallest flowering plant
  • How to see the past?
• Mathematics (91)
  • What are the labyrinths?
  • The second famous theorem of Pythagoras
  • Gulliver's geometry
  • How much water is flowing in the river?
  • Apparent dimensions of the moon
• Computer science (93)
  • Cryptographic methods
  • Methods for restricting access to information
  • Viewers and converters
  • Architectures of multiprocessor systems
  • Client-server model
• Astronomy (96)
  • When do the seasons begin?
  • Are the days equal to each other?
  • Satellite triangulation
  • Gravitational fields and light beams
  • How to land a spacecraft lander
• Geography (103)
  • Langkawi sky bridge
  • Drawings of mount Brandberg
  • Geographic names that "suggest" and "deceive"
  • Time to travel. Part 1
  • Time to travel. Part 2
• Geology (94)
  • Groundwater as liquid ore
  • Continental drift theory
  • Breakup of Pangea and Gondwana
  • Rivers in the ocean
• Archeology (123)
  • Pyramid at Cuicuilco
  • Excavations of Penjikent of ancient Sogdiana
  • Finding Eldorado
  • Ancient Olympia
• Miscellaneous (80)