The human heart starts as a single tube inside a developing baby. It grows quickly, bending and expanding into a soft sac of muscle the size of the infant’s fist. It usually develops flawless… ...

The heart icon looks nothing like a human heart. Here’s why. Lilly Price. USA TODAY. Sweethearts Candy may be gone this Valentine's Day, but that shape – you know the one! – is everywhere.

Suffice it to say, the human heart is a precious but ever so fragile part of our being, one that can engender feelings good and bad. When these bad feelings (or, worse yet, ...