The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km every day.
What’s the rarest substance on Earth? Only 28 grams of it exist on the Earth. It is Astatine.
Venus and Uranus are the only planets that rotate clockwise (retrograde rotation.)
Oxygen need for burning. The wood in the hearth covered with ash. So hearth won’t glow well. But if we blow to the hearth the ash go away then the hearth burning well. If we blow to the candle flame the upper air and the wax vapor removed, finally the flame quit.
When we blow in to a hearth it starts to flame. But if we blow a candle it extinguish.
Normally density of the orange seeds is higher than density of the water. But when we add sugar into the water, density of the mixture exceeds density of the seeds. That’s why seeds start to float when we add sugar in to orange juice.
While you make orange juice, seeds are submerged in the bottom although when you add sugar, seeds start to float? Can you guess?
Lithium can alter how you think and has been known to “cure” certain mental illnesses. In fact, lithium is used in a lot of psychoactive drugs.
Each kidney contains 1 million individual filters. They filter an average of around 1.3 liters of blood per minute, and expel up to 1.4 liters a day of urine.