Throughout the world, human skin color has evolved to be dark enough to prevent sunlight from destroying the nutrient folate but light enough to foster the production of vitamin D
Space comes in degrees of emptiness, but even in the wasteland between galaxies it is not a complete void
Electrostatic discharges threaten to halt further shrinking and acceleration of electronic devices in the future
Biologists and engineers are devising early-warning systems that can detect a bioterrorist attack in time to blunt its effects
It's not just about transportation: the transition to fuel-cell cars could transform energy infrastructures and developing economies while helping the environment
People with nerve or limb injuries may one day be able to command wheelchairs, prosthetics and even paralyzed arms and legs by "thinking them through" the motions
Proven systems and well-prepared people are our best protection against bioterror
Deadline: Jun 29 2013
Reward: $7,000 USD
The Seeker for this Challenge desires proposals for chemical methods that could rapidly degrade a dilute aqueous solution
Deadline: Jul 30 2013
Reward: $100,000 USD
The Seeker desires a method for producing pseudoephedrine products in such a way that it will be extremely difficult for clandestine che
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