Active Challenges

These are the challenges currently open for your solutions. Challenge descriptions on this page are only summaries. Registered solvers can access full description versions of the challenges.

Challenges

difficulty

The seeker operates one of the largest limestone quarries in the world: approximately 6 million tons of limestone aggregates are produced each year. The use of a wet

Submission deadline: Dec 5, 2019
295
Dec 5, 2019
Sep 4, 2019
difficulty
Submission deadline: Dec 5, 2019
102
Dec 5, 2019
Sep 4, 2019
difficulty

It is one of the great dilemmas of climate change: We take such comfort from air conditioning that worldwide energy consumption for that purpose has already tripled since 1990.

Submission deadline: Dec 31, 2019
300
Dec 31, 2019
Jul 24, 2019