What did homo erectus invent?

The first hominid species to move out of Africa and extend across Europe and Asia, including Indonesia. They created and used tools from the Oldowan and Acheulean technology. It has also been suggested that Homo erectus was the first to use rafts to cross water, to function in hunter-gatherer societies, and possibly used fire (I say possibly because the Homo erectus site of Zhoukoudian has some debate about whether or not fire was used). Also, Homo neanderthalensis and Homo sapiens are descendents of Homo erectus, so Homo erectus gave rise to our species.