Short answers, pulled from the story.
French navigator Jules Dumont d'Urville coined the name Melanesia in 1832. He derived the term from Greek words meaning black and island to distinguish dark-skinned inhabitants from lighter-skinned peoples of Polynesia.
The first migration into the ancient continent of Sahul occurred over 40,000 years ago. This movement involved hominid populations dispersing along the southern edge of Asia to reach the landmass that united Australia and New Guinea.
There are 1,319 languages scattered across the region of Melanesia. This density averages one language for every 716 square kilometers, making it nearly three times more diverse than Nigeria.
Melanesians carry DNA from Denisovans that makes up between 4% and 6% of their genome. This genetic signature is unique to the ancestors of the present-day people of the Melanesian region north and north-east of Australia.
The Melanesian Spearhead Group is a regional preferential trade agreement formed by Vanuatu, the Solomon Islands, Papua New Guinea, and Fiji. This organization serves as a formal basis for the people to assert their sovereignty and cultural distinctiveness.
New Caledonia and Norfolk Island are geologically part of the submerged continent of Zealandia. This vast submerged continent stretches across the southwestern Pacific and includes the outer bounds of the sheltered oval-shaped coral sea.