Archimedes’ “Eureka!” Moment
The ancient Greek scientist Archimedes made a famous discovery about water while taking a bath. According to legend, he noticed that when he got into the tub, the water level rose and spilled over. This observation led him to understand that the volume of water displaced must be equal to the volume of the part of his body submerged.

Excited by this insight into buoyancy, Archimedes jumped out of the bath and ran through the streets shouting “Eureka!” (which means “I have found it!” in Greek). This principle helps explain why objects float or sink in water and is fundamental in physics and engineering.

This story captures how a simple observation of water led to a groundbreaking scientific principle still taught today. If you want, I can share more anecdotes about water or its mysteries!

Fun Thought
If you removed all the water from your body, what’s left would be mostly carbon-based molecules—the building blocks of life like proteins and DNA.


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How Much of Us Is Water?
About 60% to 70% of the human adult body is water by weight.

Babies have even more—around 75% water.

Water is found inside cells (intracellular fluid), outside cells (extracellular fluid), in blood, and in all bodily fluids.

Why Are We So Much Water?
Water is essential for life: It’s the medium where almost all biochemical reactions happen.

It transports nutrients and oxygen to cells and removes waste.

It regulates body temperature through sweating and respiration.

It lubricates joints and cushions organs.

But We’re More Than Just Water
Our bodies also contain proteins, fats, carbohydrates, minerals, and nucleic acids—all built from atoms arranged in complex molecules.

These molecules give us structure, function, and identity beyond just being “water.”


