Short answers, pulled from the story.
The Lower Paleolithic is the earliest subdivision of the Paleolithic, or Old Stone Age. It spans from around 3.3 million years ago, when the first evidence for stone tool production and use by hominins appears, until around 300,000 years ago.
The Lower Paleolithic spans the Oldowan, or Mode 1, and the Acheulean, or Mode 2, lithic industries. The Oldowan developed from about 2.6 million years ago, and the earlier Lomekwian technology at Lomekwi 3 in Kenya dates to as early as 3.3 million years ago.
Lower Paleolithic hominins included possible australopithecine toolmakers such as Australopithecus garhi, then Homo habilis, Homo erectus by about 1.8 million years ago, and Homo heidelbergensis by some 800,000 to 600,000 years ago. Homo sapiens first appeared about 300,000 years ago.
Diet shifted from the mostly frugivorous or omnivorous diet of Australopithecus to the carnivorous scavenging lifestyle of early Homo, then to active hunting under Homo erectus. Climate changes in East Africa dried the climate and expanded savannah, reducing the fruits that earlier hominins relied on.
Lower Paleolithic tools in India belong to the Madrasian culture, named for the type site of Attirampakkam, where the oldest tools date to 1.5 million years ago. Robert Bruce Foote discovered the sites in 1863, and quartzite tools have also been found from Pinjore in Haryana to Nalagarh in Himachal Pradesh and in the riverbeds of Gujarat.
The Lower Paleolithic ended around 300,000 years ago, when technology, social structures, and behaviour grew more complex with prepared-core lithics and the earliest burials. The Middle Paleolithic followed and recorded more advanced prepared-core tool-making technologies such as the Mousterian.