another interesting story - Researcher doesn’t want a war over ancient hand grenade study When Professor Carney Matheson published a paper claiming to have found evidence of a medieval hand grenade, he knew he was himself stepping into an academic battleground.
A large number of rounded containers of a similar shape (referred to as sphero-conical by researchers, with a rounded top and a tapered base) have been found across the Middle East dating from between the 9th and 15th centuries ... The research has been published in the journal PLOS One.(read on)

PLOS one paper - Composition of trace residues from the contents of 11th–12th century sphero-conical vessels from Jerusalem