Science Facts Set-37

• The safety match was invented by Gustaf Erik Pasch (in the year 1844). It was later improved by Johan Edvard Lundström.
• Cartography is the science of making maps.
• Cobalt-60 is an artificial radioactive isotope of cobalt used for sterilizing surgical instruments.
• Photoelectric effect was discovered by Heinrich Hertz and Wilhelm Hallwachs in the year 1887.
• Sheep can recognize individual human and sheep faces, and remember them for years.

• Silumin is an alloy of aluminium and silicon used for casting purposes.
• Molten lava is up to 100,000 times as viscous as water.
• An acre of rich fertile farmland may contain up to 1,750,000 earthworms.
• The first colour photograph was created by the Scottish physicist James Clerk Maxwell, with the help of the English photographer Thomas Sutton, in the year 1861.
• Capybara is the largest living rodent in the world.

Science Facts Set-36

• One litre human blood contains about 4,000,000,000 - 11,000,000,000 white blood cells.
• Tachometer is an instrument used to measure the speed of revolution of a revolving disc or shaft.
• Sloth bears are used as performing pets due to their tameable nature.
• Ballistics is the branch of mechanics concerned with the study of projectiles.
• More than 80% of the total described animal species of the Earth are arthropods.

• Silicon is the second most abundant element in the Earth's crust (the first being Oxygen).
• As gamma rays are a form of ionizing radiation, they pose severe health hazard when absorbed by living tissue.
• The mass of Planet Saturn is roughly 95.152 times the mass of the Earth.
• Capillary feed fountain pen was invented by Lewis Edson Waterman.
• Polar bears are nearly invisible under infrared photography.

Science Facts Set-35

• The saltwater crocodile is the largest living reptile in the world.
• Stars account for 98% of the matter in a galaxy.
• Meninges is a system of membranes that encloses the brain and the spinal cord.
• The axial tilt of the Earth is nearly equal to 23.4°.
• The African bush elephant is the largest living terrestrial animal in the world.

• The concept of atomic number was first proposed by Henry Moseley.
• Hardness of a substance is measured by using Mho's scale.
• Safety Pin was invented by Walter Hunt in 1849.
• The estimated mass of the Earth is 5,940,000,000,000,000,000,000 metric tons.
• The Orangutan is the largest tree-dwelling mammal in the world.