The claim-testing gang comes face-to-face with a living organism from another planet and learn what conditions are perfect to support life on a planet.

The HMS Beagle, carrying Charles Darwin, sailed for five years and circumnavigated the world. Darwin recorded his observations in journals and later published them in 1839. This site contains pictures related to this expedition.

Over the course of many years, humans evolved to abandon foraging and took up farming for their food needs. Scientists are still not sure why humans abandoned foraging and took up farming in several places around the world at about the...