Short answers, pulled from the story.
The first Homo erectus fossil was discovered in 1891 on the muddy banks of the Trinil river in Java, Indonesia. Dutch military doctor Eugène Dubois unearthed a single skullcap and molar from this site and named the discovery Pithecanthropus erectus.
The oldest known specimen of Homo erectus is a skullcap designated DNH 134 that dates back 2.04 million years. This fossil was discovered in Drimolen, South Africa, and coexisted with the robust australopithecine Paranthropus robustus.
Homo erectus possessed extraordinarily thickened bones known as pachyosteosclerosis and a thick brow ridge called the supraorbital torus. These individuals typically reached heights of 1.85 meters and weighed around 60 kilograms with a short barrel-shaped chest.
Homo erectus invented the Acheulean stone tool industry which featured large handaxes that spread across Western Eurasia over hundreds of thousands of years. American archaeologist Hallam L. Movius first noted the lack of these tools in East Asia in 1948 when he drew the Movius Line.
A 1.77 million year old Homo erectus georgicus specimen known as the single-toothed specimen survived for several years after losing all but one tooth. This survival required group care and suggests the species used medicinal plants and supported infirm members of their community.
The spinal column of the 1.6 million year old Turkana boy could not support properly developed respiratory muscles required to produce speech. However, the species may have used basic proto-language in combination with gesturing and built the framework for fully-fledged languages.