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
Hans-Henning Judek
Tokyo, Tokyo Prefecture, Japan
more
About
Challenges
Following
Activity
Awards
Activity
About
Challenges
Following
Activity
Awards
July 16, 2019, 9:25 a.m. PDT
Solar Prize Round 2
registered for challenge
