"As long as there are humans, there will be human evolution"

As human brains continue to evolve, will humans eventually develop gigantic heads and scrawny bodies, as depicted in some sci-fi films? Historically, the birthing process has limited brain size, because babies’ heads had to fit through the birth canal.

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Today, however, Caesarian sections circumvent that process. As many as 46 percent of babies born today in China are delivered via C-section, Pobiner said. With advances in fertility and better postnatal medical care, she asked, “Are we screwing with natural selection?”

The world population is growing, and a bigger population also evolves faster, Pobiner said. But, with rising sea levels and less land available, waterborne and airborne illness could spread more easily, Pobiner said.

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