EarthFirst land plants plunged Earth into ice age When the first simple mosses colonised the land, they unleashed vast ice sheets and triggered a mass extinction 51¶¯Âþ
LifeBefore DNA, before RNA: Life in the hodge-podge world A simple nucleic acid called TNA can behave like a protein, suggesting the first life on Earth may have used a mix of similar chemicals 51¶¯Âþ