50 amazing facts in Hindi and English, short and true

"Interesting facts" (रोचक तथ्य, "rochak tathya" in Hindi) are things that are true, surprising and teach something new. A good fact does not just entertain — it sparks curiosity: "Why is that so?" Here are 50 short, checked facts in five groups, with links to our full articles where we have them.

10 science facts

1. Sunlight takes about 8 minutes 20 seconds to reach the Earth.
2. Water expands when it freezes, so ice floats on water.
3. Diamond and the graphite in a pencil are both pure carbon.
4. Sound travels about four times faster in water than in air.
5. Lightning is several times hotter than the surface of the Sun.
6. The lowest possible temperature is −273.15 degrees Celsius.
7. Venus is the hottest planet in the solar system.
8. Saturn's average density is lower than that of water.
9. To escape the Earth's gravity you need a speed of 11.2 km a second.
10. The seven colours of the rainbow are hidden in the Sun's white light.

10 facts about India

1. India's first satellite, Aryabhata, was launched on 19 April 1975.
2. The Ganga is the longest river within India.
3. India's Constitution is the longest written constitution in the world.
4. The Eighth Schedule of the Constitution lists 22 languages.
5. India's first passenger train ran on 16 April 1853.
6. Chandrayaan-3 was the first craft to land near the Moon's south pole.
7. Jaipur was painted pink in 1876.
8. Wular is India's largest freshwater lake.
9. India Gate is about 42 metres tall.
10. The first Hindi newspaper, "Udant Martand", came out in 1826.

Did you know? Before calling something an "interesting fact", ask three questions: who said it? Does a reliable source confirm it? Is it still true today? Many viral "facts" fail these questions.

10 facts about the world

1. Vatican City is the smallest country in the world.
2. The Burj Khalifa (828 metres) is the tallest building in the world.
3. The Nile is generally considered the longest river in the world.
4. The Amazon carries the most water to the sea of any river.
5. The Pacific Ocean is bigger than all the continents put together.
6. Russia has 11 time zones.
7. Antarctica is the largest desert in the world.
8. The shortest war in history (1896) lasted less than 45 minutes.
9. Everest's official height is 8,848.86 metres (measured in 2020).
10. The highest wave on record rose in Lituya Bay, Alaska, in 1958.

10 facts about animals

1. An octopus has three hearts.
2. An elephant's pregnancy lasts about 22 months.
3. Crows remember human faces — read Interesting facts about crows.
4. A firefly's light is "cold light".
5. Every tiger's stripes are different.
6. Honey bees dance to show the way to flowers.
7. The blue whale is the largest animal known to have lived on Earth.
8. The cheetah is the fastest land animal; cheetahs were brought back to India's Kuno National Park in 2022.
9. The snow leopard cannot roar.
10. In a dive, the peregrine falcon can go faster than 300 km an hour.

10 facts about the human body

1. An adult body has 206 bones.
2. The heart beats about one lakh (100,000) times a day.
3. The brain uses about 20 per cent of the body's energy.
4. Everyone's fingerprints are different.
5. The skin is the body's largest organ.
6. The smallest bone is the stapes, inside the ear.
7. We are slightly taller in the morning than at night.
8. About 60 per cent of the body is water.
9. Red blood cells live for about 120 days.
10. We blink 15–20 times a minute.

Read more: 15 amazing science facts · 10 interesting facts about India · 20 facts about the human body.