Was Homo floresiensis just a human with microcephaly, according to Gregory Forth?

Gregory Forth says few people now support the microcephaly idea, first pushed by a senior Indonesian prehistorian who was left off the discovery team. Microcephaly shrinks the head but not the body, and the fossils are small in both. The live debate is whether the species belongs in Homo at all: Chris Stringer of the Natural History Museum in London suggests a far older, near-australopithecine branch, and team member Peter Brown proposed a new genus, Sundanthropus.

• Forth calls the argument that a recent fossil must be Homo a linear view of evolution.
• He says the find supports a bushy human family tree, with several lines living side by side.

▸In their words

“not least of all the brain size, which is about that of a chimpanzee” Gregory Forth · at 1:22:37 — open in the transcript →

Source: our own transcription of the episode. The full conversation is on The Joe Rogan Experience (2026-11-05). Read the whole episode summary →

▸More from this episode