"We implemented a pre-registered, citywide experiment to test the effects of three high-pay-off, geographically targeted lotteries designed to motivate adult Philadelphians to get their COVID-19 vaccine...we do not detect evidence of any overall benefits."

• vaccines

• Behavioral economics programs
• Peer-reviewed research
• COVID Engagement Projects

We create data and technology solutions for better health outcomes in low- and middle-income countries. By working alongside health advocates, governments, local communities, donors, and manufacturers, we provide reliable

• health
• vaccines
• Affordable and clean energy

• Smart Cities and sensors