- 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.
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