The Power of One

I was thinking about different elements in nature that alone, are simple creations. However, when combined, create a powerful entity. Some examples:

1. A drop of water is merely a drop, but combined with many just like it = an ocean or giant wave.

2. A single hair is a flimsy little strand, but combined comprise the lethal horn of a rhino.

3. A single grain of sand can barely be felt, but combined with others forms a huge land mass.

4. Any ideas?