By Date
nuclear bomb
0 comments
cylindrical / rectangle grenade
0 comments
very low thrust rocket engine
2 comments
the uranium atom
3 comments
gravity ring
0 comments
layered solid fuel
1 comments
50 layers of qrtz
9 comments
ttan gold conductor
0 comments
Square hydrogen bomb
1 comments
beware of giant grenades.
0 comments
orbit
1 comments