In ancient times, chewing gum was made from natural tree saps.

When vinegar is added to hot milk and stirred for a while, it leaves behind

The longest structure ever built is the Great Wall of China, which is almost 3,000

When a person is electrocuted (which occurs upon contact with a voltage of around 1

Burrowing animals often build their homes on slopes, which helps prevent rainwater from entering their

Airports store unclaimed luggage and items for up to 90 days, during which time efforts

Giraffes have the shortest sleep requirements of any mammal. They are also known to have

Due to a change in atmospheric pressure, our ears feel a certain discomfort at higher

When the moon revolves around the Earth, it spends half the time on the same

Colour is actually a component of light.