According to international definition fog occurs when visibility is 600 feet (200m) or less

Smiling releases natural pain killing hormones endorphins and serotonin making us feel good

Astronomers suggest that approximately 10 billion earth-like planets may exist in our galaxy

Dry ice does not melt It sublimes which means it goes directly from solid form to gaseous form

Dry ice does not melt It sublimes which means it goes directly from solid form to gaseous form

Without any greenhouse effect Earth would be cold and lifeless with an average temp of 4ºF

Without health life is not life; it is only a state of langour and suffering - an image of death

The number system was invented by India Aryabhatta was the scientist who invented the digit zero

Leap day doesn t happen every 4 years On a span of 400 years there are only 97 leap days not 100

Sir Isaac Newton was only twenty three years old when he discovered the law of universal graviton

Gold is the only metal that doesn t rust even if it s buried in the ground for thousands of years

Tobacco smoke contains at least 4 000 chemicals including: ammonia cyanide arsenic and formaldehyde

The popcorn pops because each kernel has a small bit of water in it When it gets hot enough it pops

It s possible to permanently change a brown eyes to blue using a specific type of laser eye surgery

Any free-moving liquid will form itself into a sphere in outer space because of its surface tension