This Week: Ancient water = ancient habitat?
In the News: Sinkholes: When the ground collapses!
Coming Thursday: Roaches: A lot smarter than you thought!
Geologic dating shows that water has been trapped more than 2 kilometers underground since before the Cambrian explosion. This water contains chemicals that support bacteria in other places. Could the deep biosphere contain relics of the most primitive life? Could such life exist on Mars? More »
Smelters refine aluminum ore, but not iron ore, with electricity. A new electrolytic process for refining iron ore could save vast amounts of greenhouse gases. More »
For 15 years, we've presented the science behind the news. The Why Files are accurate, engaging, entertaining and educational. Check our links from national science teaching standards to specific Why Files -- all 750 of them! Whether it's geology or archaeology, weather or human behavior, The Why Files has it covered. More »
Tornadoes need wet air, dry air, and wind shear. What explains the big improvement in tornado prediction? Is climate change boosting these storms? More »
Was the epic 2011 heat wave in Texas due to global warming or natural variation? More »
What are sinkholes, and how dangerous are they? Can we detect and prevent them? Should you be asking more questions about the ground we're standing on? More »
British archeologists unearthed bones of Richard III, who died in 1485 after a murderous reign. How do bones, isotopes, historic records, DNA and grave goods tell us about the dead? More »
Three gross "biotherapies": Leeches suck blood after surgery. Maggots clear dead tissue from wounds. Parasitic worms fight ulcerative colitis. More »