Nature Production / Bombardier Beetle (Pheropsophus jessoensis) protecting itself by ejecting a boiling, noxious chemical spray, Nagasaki, Japan.

Christophe Courteau / Rusty barrels at the historical site of Virgohamna where, in 1897, the hydrogen balloon 'Omen' (the Eagle) sailed northward in a failed attempt to reach the north pole with 3 Swedish ballooners led by...

Wild Wonders of Europe / López / Hydrogen sulphide (H2S) pond with trees reflected in water, Bog forest, Kemeri National Park, Latvia, June 2009

Wild Wonders of Europe / López / Hydrogen sulphide (H2S) pond in mist, Bog forest, Kemeri National Park, Latvia, June 2009

Wild Wonders of Europe / López / Hydrogen suphide (H2S) pond at dusk, Bog forest, Kemeri National Park, Latvia, June 2009

Wild Wonders of Europe / López / Hydrogen sulphude (H2S) pond with trees reflected in water, Bog forest, Kemeri National Park, Latvia, June 2009

Wild Wonders of Europe / López / Hydrogen sulphide (H2S) pond with trees reflected in water at dusk, Bog forest, Kemeri National Park, Latvia, June 2009

Wild Wonders of Europe / López / Hydrogen sulphide (H2S) pond with trees reflected in water, Bog forest, Kemeri National Park, Latvia, June 2009

Ashley Cooper / Hydrogen filling station on the outskirts of Reykavik, Iceland. The filling station is owned by Shell and is part of a project to help Iceland move from away from imported oil, to powering its vehicle...

Ashley Cooper / Hydrogen filling station on the outskirts of Reykavik, Iceland. The filling station is owned by Shell and is part of a project to help Iceland move from away from imported oil, to powering its vehicle...

Ashley Cooper / Hydrogen filling station on the outskirts of Reykavik, Iceland. The filling station is owned by Shell and is part of a project to help Iceland move from away from imported oil, to powering its vehicle...

Remi Masson / Bacterial biofilm and hydrogen sulfide on the bottom of the river Rhone. Alps, France, April.