Sandra Fisher-Martins: The right to understand. Shai Agassi's bold plan for electric cars. Emily Levine's theory of everything. Joshua Klein on the intelligence of crows. David Merrill demos Siftables. Kary Mullis' next-gen cure for killer infections. Nathan Myhrvold: Could this laser zap malaria? Adam Grosser and his sustainable fridge. Michael Pritchard's water filter turns filthy water drinkable. William McDonough on cradle to cradle design.