The Great Wall was built over multiple dynasties.

Spices like cinnamon, cardamom, and cloves were once more valuable than gold by weight.

Architecture that uses passive solar heating, natural ventilation, and local materials is called vernacular architecture.

The Great Fire of London began in a bakery in 1666.

The number 0.999... (repeating) is mathematically equal to 1.

Water expands when it freezes, which is why ice floats.

Apples float in water because 25% of their volume is air.

You are more likely to die from extreme heat than extreme cold.

The refrigerator allowed long-term food storage.