[change] two new ICT-related Gates Foundation Grand Challenges

Two new, ICT-related Gates Foundation Grand Challenges for $100,000: n Cheap data collection for financial services n Encourage adoption of mobile payments by merchants Deadline is May 13. More info. http://www.impatientoptimists.org/Posts/2015/03/Two-Challenges-to-Help-Two-B illion-Reach-Financial-Security