BBC

How a sperm manages to reach the fallopian tubes is clear at last, scientists say.

The SpaceX Dragon capsule returns to Earth after its mission to the International Space Station.

How a remote community in Guyana is using cutting-edge software and equipment against deforestation.

The second man to set foot on the Moon, launches a virtual reality movie detailing his plan to get humans to Mars.

Taronga Zoo's baby pygmy hippopotamus - the first born in seven years - has made its first public appearance.

Researchers in the US are working with dolphins in an effort to work out why closely related whale species in the wild strand themselves on land.

Science correspondent Rebecca Morelle describes her violent encounter with Europe's most active volcano.

A computerised system for injecting medicine without using needles has won an innovation award at the South by SouthWest Interactive technology conference in Austin, Texas.

A bird that watched its own reflection for hours becomes the subject of internet fun.

Fifty years ago, the supertanker the SS Torrey Canyon hit rocks off the coast of Cornwall, spilling more than 100,000 tonnes of crude oil. But it was the clear-up operation that led to the real environmental disaster.

Researchers trace the parental history of Canadian rocks to a time just after Earth's formation.

Chile signs a historic deal with Kristine McDivitt Tompkins to create a "network of national parks”.

Volcano watchers suffer cuts, bruises and burns as an explosion pelts them with hot rocks and steam.

The UK's favourite yellow submarine is set to leave port for the Antarctic

Chase planes flying behind a jet are providing new insights into aircraft pollution.

Germany will use its G20 Presidency to nudge world leaders towards a global price on carbon, say officials.

In his last BBC interview, the statistician highlighted five key ways demographics are shaping the world.

Record numbers of songbirds are still being killed on a British military base in Cyprus.

The art of science - captivating scientific images from the 2017 Wellcome Image Awards.

Astronomer Susan Murabana takes a telescope round Kenya to enthuse schoolchildren.