Fireflies looking for a mate flash through the summer evening in many parts of the world. But the light has nothing to do with romance. It's a biochemical reaction that causes a signal in the fireflies' glow cells.
Millions of people around the world are observing the annual Earth Hour to raise awareness about climate change. Dubai and Australia's Sydney Opera House were among the places to join the blackout.
Nord Stream 2 has received final permission to start construction and operations in Germany. The US and EU's eastern members fear the gas pipeline will empower Russia.
Whoever takes a swim along Puerto Rico's shores at night will witness a special show. The water starts to glow in a bright blue and green. The effect is called bioluminescence - it's our natural phenomenon of the week.
Many Ugandans have no access to electricity and rely on wood for cooking, which has led to rapid deforestation. Two enterprising schools have found sustainable solutions that they hope will inspire others.
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