Science Concepts Explained
S I M P L Y

Liquid mercury is already denser than iron, at 13.53 g/cc. Freezing a liquid increases its density. So, does freezing it finally beat osmium, the densest element on Earth?

A cheetah can outrun almost anything on land, yet it weighs a small fraction of an elephant. If speed simply increased with size, the largest animals would be the fastest.