LifePet theory: Why domestic animals look cute Darwin wondered why floppy ears, spots and other traits are common in domesticated animals. Cognitive biologist Tecumseh Fitch thinks he has the answer Opinion
LifeAlien life arrested by climate catch-22 Other Earth-like planets may be caught in a dilemma – they need stable, warm climates to support complex life, but a lack of life may preclude this ¿ìè¶ÌÊÓÆµ