Medusa received help. He received a mirrored shield from Athena, gold, winged sandals from Hermes, a sword from Hephaestus and Hades's helm of invisibility. Since Medusa was the only one of the three Gorgons who was mortal, Perseus was able to slay her while looking at the reflection from the mirrored shield he received from Athena. During that time, Medusa was pregnant by Poseidon. When Perseus beheaded her, Pegasus, a winged horse, and Chrysaor, a giant wielding a golden sword, sprang from her body. Jane Ellen Harrison argues that "her potency only begins when her head is severed, and that potency
Bert van Sprang in February 1976. The main-belt asteroid 3098 van Sprang was named after him. Bert van Sprang Bernardus Wilhelmus Maria "Bert" van Sprang (20 June 1944 in Tilburg – 17 November 2015 in Pijnacker) was the founder of the Dutch youth division ("JWG", or "Jongerenwerkgroep") of the Dutch association of meteorology and astronomy ("NVWS", or "Nederlandse Vereniging voor Weer- en Sterrenkunde") in 1967. Activities carried out by Van Sprang for the JWG included the organization of astro camps, the setting up of a program to build telescopes cheaply, and the writing of many booklets on astronomy topics. He was also program