If you live in the northern hemisphere, summer is approaching. When the sunshine starts to become intense it may be time to take the sunscreen out of the cupboard. Why do you do this though?
In April 1953, James Watson and Francis Crick published a report in the scientific journal Nature of their proposed structure of DNA – the famous double helix, earning them the Nobel Prize in Physiology or Medicine in 1962. They also suggested that DNA replicated by semi-conservative replication, but how could this theory be confirmed experimentally?