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A high school where a teacher was fatally stabbed in France has been evacuated over a bomb threat. The attack happened at City School Gambetta-Carnot in the town of Arras in the north of the country on Friday at around 11am. Two other people were injured. The prefecture of the northern Pas-de-Calais region said the decision was made to evacuate the school after police received a bomb threat via its website. A bomb disposal team is on site, the prefecture said, adding that “all precautionary and safety measures” are being taken until the site is cleared. France is on heightened alert against feared terror threats following the stabbing incident in which a teacher, named locally as Dominque Bernard, died. Schools across the country will hold a moment of silence after the teacher was killed and three other people were injured last week in the attack by a former student suspected of Islamic radicalisation. Hours following the attack, Emmanuel Macron visited the school, describing the attack as the result of “barbaric Islamist terrorism”, before praising the killed teacher. “The teacher who was killed had come forward to protect others and had without doubt saved many lives,” he said. Counter-terrorism authorities are investigating Friday’s stabbing, and the suspected assailant and several others are in custody, prosecutors said. The suspect had been under recent surveillance by intelligence services for radicalisation. The prosecutor said the alleged assailant was a former student there and repeatedly shouted “Allahu akbar,” or “God is great”, during the attack. Another teacher and a security guard are in a critical condition with wounds from the stabbing, police said. The counter-terrorism prosecutor said a cleaning worker was also injured. More follows on this breaking news story.... Read More French schools hold a moment of silence in an homage to a teacher killed in a knife attack France is deploying 7,000 troops after a deadly school stabbing by a suspected Islamic radical Teacher killed in ‘terror attack’ at French school ‘died protecting others’ from knife rampage

The name “core” suggests something hard and fixed but, it turns out, the Earth’s core is leaking. That is, at least, according to a team of top scientists, who drew the conclusion after analysing 62-million-old Arctic rocks. Geochemists from the California Institute of Technology and Woods Hole Oceanographic Institution detected record concentrations of helium 3 (3He) and helium 4 (4He) isotopes in the rocks, which suggest a slow trickle up from the very heart of our planet. They believe there could be reserves of the elusive gas buried some 2,900km underground. Helium is a surprisingly rare element on the Earth’s surface and experts have yet to establish just how much of it remains trapped deep beneath our feet. However, the new discovery has provided them with a fresh insight into the most mysterious region of our world. Understanding the presence of these helium isotopes could illuminate key processes in the core, such as how the Earth generated its life-protecting magnetic field. Most helium in the universe dates back to the Big Bang which occurred 13.8 billion years ago. The Earth swallowed up some of this as an infant planet, but mostly burped it all away during its 4.6 billion-year-long formation, as Science Alert reports. This means that any traces of helium found in volcanic rock – such as the samples unearthed in the Arctic – are believed to come either from pockets of mantle that are yet to release their helium, or from a vast, slow-leaking reserve. Basaltic lavas on Canada's Baffin Island contain some of the world's highest ratios of 3He to 4He, which geologists believe indicates that the gas's presence is not to do with the atmosphere, but rather the sign of deeper terrestrial origins. Several years ago, geochemist Forrest Horton uncovered helium isotope ratios of up to 50 times that of atmospheric levels in samples collected from Baffin's lava fields. This unusual concentration was also detected in lavas collected from Iceland. Horton and his team wondered if the helium in both samples may have derived from an ancient reservoir deep within the crust. And, it seems, their hunch may have been right. Their latest analysis – including specimens of the mineral olivine taken from dozens of sites across Baffin and surrounding islands – has delivered the highest ratio of 3He to 4He ever recorded in volcanic rock – measuring nearly 70 times anything previously detected in the atmosphere, as Science Alert notes. The team also considered ratios of other isotopes in order to rule out factors that may have altered the helium’s composition post-volcanic eruption, and found that the ratio of isotopes in the gas neon also matched the conditions present during the Earth’s formation. Despite advances in geology, the Earth’s core remains a great mystery, given that we have no way of directly exploring its core. The deepest hole humans have ever dug – branded the "entrance to hell" – extended an impressive 12,263m (40,230ft) down, but even that doesn’t come close to breaking through the crust to the layers beneath. Still, thanks to techniques like seismic tomography – which analyses how waves of energy travel through different materials during earthquakes – we’ve been able to map out the world’s interior. And carefully crafted simulations, based on the thermodynamics and pressures of our planet’s innards, suggest reserves of noble gases (like helium and neon) trapped in the core could have been protected as the Earth grew before seeping into the surrounding mantle over time. If the core is leaking, this could teach us a thing or two about how planets like ours form and how life, eventually, emerges. Sign up for our free Indy100 weekly newsletter Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings