Explore
Challenges
For Business
For Startups
Who We Are
Results
Get Started
Launch a challenge
Connect with talented problem solvers
Solve a challenge
Join our community and win prizes
Log In
menu
log in
Explore Challenges
For Business
For Startups
Who We Are
Results
share
Follow
Following
Unfollow
message
Harry Sangree
New Providence, New Jersey, United States
more
About
Following
Followers
Activity
Awards
Activity
About
Following
Followers
Activity
Awards
July 22, 2026, 10:08 a.m. PDT
Reducing Malaria in Homes with Improved Air Cavity Ventilation
replied a new topic to
About Challenge Updates
Jan. 5, 2026, 7:45 a.m. PST
Affordable Tools to Find and Mark Underwater Explosive Ordnance
replied a new topic to
Clarification of the Challenge
Jan. 2, 2026, 6:08 p.m. PST
Affordable Tools to Find and Mark Underwater Explosive Ordnance
replied a new topic to
Clarification of the Challenge
Dec. 23, 2025, 1:10 p.m. PST
Affordable Tools to Find and Mark Underwater Explosive Ordnance
replied a new topic to
Clarification of the Challenge
Dec. 19, 2025, 5:52 a.m. PST
Affordable Tools to Find and Mark Underwater Explosive Ordnance
replied a new topic to
Clarification of the Challenge
July 15, 2025, 7:56 a.m. PDT
Reducing Malaria in Homes with Improved Air Cavity Ventilation
replied a new topic to
Malaria in Kenya prevention
Load more
