How the ECG Machine Let Us Listen to the Heart: A 1903 Breakthrough
In 1903, Dutch physiologist Willem Einthoven transformed medicine by inventing the electrocardiogram (ECG). Using a string galvanometer the size of…
The Double Helix That Changed Everything: Discovery of DNA
In 1953, two scientists — James Watson and Francis Crick — unraveled the twisted ladder of life: the DNA double…