Diamonds are the hardest substance known to man.
Hydrogen is the most abundant element in the Universe (75%).
The typewriter was invented in 1829, and the automatic dishwasher in 1889.
No matter its size or thickness, no piece of paper can be folded in half more than 7 times.
The only letter not appearing on the Periodic Table is the letter “J”.
Hydrofluoric acid will dissolve glass.
Sound travels about 4 times faster in water than in air.
There are between 100,000,000,000 and 1,000,000,000,000 stars in a normal galaxy.
The hottest planet in the solar system is Venus, with an estimated surface temperature of 864 F (462 C).
The longest living cells in the body are brain cells which can live an entire lifetime.
The Cerebrum, also called the forebrain, is responsible for our language, memory, movement and all. As you’re reading this and trying to understand it, you’re using your Cerebrum.
Each carbon nucleus (containing six protons and six neutrons) is made up from three nuclei of helium.
It was not until 1926 that Pneumatic tyres surpassed solid tyres in numbers used on vehicles.
The normal energy used by our brain is 0.1 calories per minute, and could go up to 1.5 during activities such as puzzle-solving.
The diamond is the mineral as found in nature. There is no known material of greater hardness on Earth, so in order to carve a diamond would have to use another diamond.
The moon is a planet just like the earth, only it is even deader.
The pistol of a flower is its only protections against insects.
H2O is hot water, and CO2 is cold water
Blood flows down one leg and up the other.
Dew is formed on leaves when the sun shines down on them and makes them perspire.