SCIENCE

World Turtle Day, sponsored since 2000 by American Tortoise Rescue, is marked on Saturday 23 May 2015.

Natural weather phenomenon lead sun in Mexico City to be surrounded by a halo.

National Geographic documentary to show 3,000-year-old pyramids, temples and burial sites.

Mars Express spots collection of craters that could be remnants of supervocanoes.

Erik Sorto, paralysed 13 years ago, controls bionic arm with chips embedded into his brain

The savannahs and shrublands see large fluctuations that can influence climate in a big way.

The discovery allows for drug testing using engineered yeast strains.

Collisions of proton beams have begun at energy levels of 13 trillion electronvolts.

Ofqual: 'Even the students from the best performing schools scored poorly'.

Association faced ejection from world aquarium group without the ban.

First time dino fossil is found there, making it the 37th state with bones.

Desert kingdom's oil minister expects an end to crude by about 2050.

Rate of water loss has been 55 trillion litres of water every year.

River in southern Tasmania glows in the dark as billions of bioluminescent plankton arrive.

Wata Wata people beat, defleshed and beheaded their political enemies, study suggests.

At least 15 people have been killed in floods and 16 missing as landslides cause building collapse.

Chinese media suggests X-37B could be used as a spy satellite or weapon delivery shuttle.

An onshore pipeline ruptured along the California coast, spewing crude oil onto pristine beaches.

Top 10 new species announced by SUNY College of Environmental Science and Forestry.

Analysis of Egtved Girl remains show extensive travel during final two years of her life.

The sudden release could prove disastrous for the climate.

Bin Laden called for sustainable water systems and wanted relief network for climate victims

One-third of the oil-exposed dolphins suffered rare adrenal damage, rendering them incapable of producing some critical hormones.

Both deep and shallow quakes produce crystals under the extreme heat and pressure.

Researchers return after intriguing clues that aviation pioneer may have survived crash.

Slick threatening sea birds, migrating whales.

At 3.3 million, the earliest stone tools predate the previous oldest by 700,000 years.

Global study of 7,000 students finds biggest heroes and villains of history.

Rescue workers with sniffer dogs search for bodies buried under mud and debris in Salgar, Colombia.