On this week's show: The earliest high-altitude humans.

On this week's show: Connecting carnivores with plants and a daily news roundup.

The rights and responsibilities of robots.

Satellite data helps map the last unexplored terrain on planet Earth.

New evidence reveals the complicated history of stone tool use 400,000 - 200,000 years ago.

Hindcasting weather over the ocean near the California coast for 600 years.

Frugal engineering for global health; roundup of daily news.

Bringing cellulosic ethanol to market; roundup of daily news.

Sharing microbes around the house; roundup of daily news.

Investigating web censorship practices in China; roundup of daily news.