BBC

Fertility experts find that the left testicle is warmer, but only when a man has his clothes on.

Survey finds many common species of butterfly enjoyed a good summer this year.

One of Europe's largest dolphin populations needs special protection, say scientists measuring marine pollution.

The UK needs to move away from all single-use packaging, say MPs. But have supermarkets got the message?

The group staged a protest from a bridge in Texas ahead of the Democratic debate.

The co-founder of activist group Extinction Rebellion is among those held in "pre-emptive" raids.

A historic global agreement aimed at halting deforestation and curbing dangerous carbon dioxide emissions has failed, according to a report.

An amateur astronomer has discovered a comet that could come from outside our Solar System.

The male skeletons, buried in Roman times, have been holding hands for around 1,500 years.

Plans to restore ecosystems in the countryside will support landowners, its director says.

Scores of fires are raging across Australia's east coast, and the fire season has only just begun.

The ship is believed to be a cargo vessel sunk by a submarine during World War Two.

The approaching high-speed trials will help validate the assumptions that went into building the world's fastest car.

Astronomers discover water in the atmosphere of a "habitable" planet orbiting a distant star.

Defence chiefs want a batch of small spacecraft able to see the Earth's surface in all weathers.

The falling cost of solar power is helping it to disrupt the global energy market.

Up to 200 world leaders are expected to attend the COP26 at the Scottish Event Campus in 2020.

Scientists discover the earliest direct evidence of milk consumption by humans.

Scientists reconstruct the seconds, minutes and hours following the dino-killing asteroid impact.

Farm union unveils plan to slash emissions and combat CO2 - but critics ask why no mention of meat?