Ștefania Mărăcineanu, a Romanian physicist, has been honoured on her 140th birthday with a Google doodle. Ștefania was born in 1882 in Bucharest, Romania, and went on to become one of the pioneers in the discovery and research of radioactivity. Mărăcineanu’s PhD thesis was on polonium, an element that physicist Marie Curie discovered. During her career, she engaged in several interesting researches including studying artificial rain,…