The "Door to Hell" or the Darvaza Gas Crater is a natural gas field located in the Karakum Desert in Turkmenistan. It has been burning continuously since 1971 when it was set on fire by Soviet geologists to prevent the spread of methane gas after a drilling rig collapsed into it.
Status: solvable
Approach: CAD, scientific modeling, few telephone calls, trip to Turkmenistan
Voynich Manuscript is a corpus of unknown origin written down in unique graphemic system and potentially representing phonic values of unknown or potentially even extinct language.
Status: solvable
Approach: Multi-modal artificial intelligence, trans-disciplinary research, classic cryptographic methods
Geodetic dome providing a protective membrane around highly diversified biosphere above, around and below Berlin's Tempelhofer Field.
Status: solvable
Approach: material research, architecture, corruption
H-microfusor is a reactor for deuterium/tritium nuclear fusion whose size does not exceed 1 cubic meter and which is able to persist in the breakeven state (Q>=1) for at least 1 second.
Approach: scientific modeling, CAD, nanotechnology
Status: solvable