Live Science

What's Hot This Week How Plants Helped Make the Earth Unique Wynne Parry, LiveScience Senior Writer Land plants may have contributed to past extinctions and shaped modern rivers. Arsenic-Based Life Claim Gets Another Blow Stephanie Pappas, LiveScience Senior Writer Arsenic-based life fails to come through in test. Sponsored by: Behemoth Seagrass Clones Among Earth's Oldest Organisms Audit Your Home Energy Use