Chalk is made of trillions of microscopic skeleton fossils of plankton (a tiny sea creature).
Talc is the softest known substance.
There's enough gold in the Earth's crust to cover the entire land surface knee-deep.
Gallium is a metal which melts on palm of the hand, due to its low melting point (29.76 °C).
Each time lightning strikes, some Ozone gas is produced, thus strengthening the Ozone Layer in the Earth's atmosphere.
Mosquitoes like the scent of estrogen, hence, women get bitten by mosquitoes more often than men do.
Honey does not spoil.
The burning sensation we get from chilli peppers is because of a chemical called Capsaicin.