Practice Pakistan questions with answers and explanations.
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Louis Braille created a tactile reading and writing system.
It uses patterns of raised dots.
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Saturn has an extensive system of icy rings.
Other giant planets also have rings, but Saturn's are most visible.
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Orville and Wilbur Wright achieved a controlled powered flight in 1903.
Their aircraft flew at Kitty Hawk.
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The Moon is Earth's only natural satellite.
It orbits Earth and influences ocean tides.
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Benjamin Franklin conducted experiments linking lightning and electricity.
The kite experiment became the best-known account of his work.
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Earth rotates on its axis approximately once every 24 hours.
The side facing the Sun experiences day.
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Earth's tilted axis changes the angle and duration of sunlight during its orbit.
This produces the seasons.
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Isaac Newton formulated three laws of motion and the law of universal gravitation.
His work shaped classical physics.
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Albert Einstein developed special and general relativity.
These theories transformed modern physics.
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Dmitri Mendeleev arranged elements in a periodic system.
He also predicted properties of undiscovered elements.
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Alexander Fleming discovered penicillin's antibacterial effect in 1928.
The discovery led to the development of antibiotics.
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Edward Jenner demonstrated vaccination against smallpox in the 1790s.
His work helped establish immunization.
