Wujing Zongyao
The dating of the invention of the first rocket, otherwise known as the gunpowder propelled fire arrow, is disputed. The "History of Song" attributes the invention to two different people at different times, Feng Zhisheng in 969 and Tang Fu in 1000. However Joseph Needham argues that rockets could not have existed before the 12th century, since the gunpowder formulas listed in the Wujing Zongyao are not suitable as rocket propellant.