Rosalind Franklin

She took the photograph that helped reveal DNA's secret! Rosalind Franklin was a British scientist in the mid-1900s who used X-ray crystallography - like taking super tiny photographs of molecules.

The single most important thing she did was make a crystal-clear image called 'Photo 51' that showed a cross-shaped pattern. That pattern was the clue that DNA is a double helix, a twisted ladder carrying the genetic code.

Franklin worked carefully and patiently in a tiny lab, shining X-rays at DNA fibers and recording the patterns on photographic film. Her skill and attention to detail produced images far clearer than anyone had seen before. Scientists James Watson and Francis Crick used her photograph and data to build the famous model of DNA.

Today we know that DNA explains how living things inherit traits, which opened the door to modern genetics, medicine, and even solving crimes. Her discovery changed science forever, but she didn't get full credit while she was alive. Now many people celebrate Rosalind Franklin as a pioneer who showed the power of careful work and bright thinking. For a 10-year-old: imagine seeing an invisible code and taking its picture - that's exactly what she did. Be curious, look closely, and remember that small details can make big discoveries.