Organic Compounds Found in Martian Soil
Sukanya Charuchandra | Jun 11, 2018
Researchers also found seasonal variations in atmospheric methane on the planet that may have a geological or biological origin.  
Signs of Life on Mars?
Bob Grant | Dec 4, 2012
Tests run on Martian soil samples indicate the presence of organic compounds, but the traces of carbon may or may not have come from once-living things.
Conventional Yields Trump Organic
Bob Grant | Apr 26, 2012
A new meta-analysis of farming practices suggests that traditional methods of cultivating food plants result in heftier harvests than do organic strategies.