Henry Winkler discussed the 'debilitating' effect his character 'Fonz' had on his career as he was typecast for years after playing the famous role on 'Happy Days'

Scientists think they have discovered a previously unknown hidden structure inside the Earth’s core that could change our understanding of our planet. In school, most of us were taught there are four main layers to the Earth’s structure: the crust, the mantle, the outer core and the inner core. What we know about the Earth’s insides has mostly derived from geologists’ knowledge and observations of volcanoes and seismic waves. But now, scientists believe that there may also be a whole extra layer hidden inside the inner core that no one knew about. Earth’s molten inner core is predicted to be around 5,000 degrees Celsius in temperature and scientists have calculated that it takes up around just 1 per cent of the planet’s total volume. The discovery of a potential fifth layer to the planet’s core came a few years ago when scientists used an algorithm to model thousands of scenarios of the inner core to observe the length of time it takes seismic waves to travel through Earth based on data by the International Seismological Centre. Sign up to our new free Indy100 weekly newsletter Scientists were able to analyse how different material properties within the inner core would affect seismic waves differently and found that some scenarios were certainly more likely than others. The algorithm showed how different materials altered the angle of seismic waves, leading them to hypothesise that there was a change of material somewhere in the inner core. Joanne Stephenson, an Australian National University geophysicist, explained: “We found evidence that may indicate a change in the structure of iron, which suggests perhaps two separate cooling events in Earth's history.” She continued: “The details of this big event are still a bit of a mystery, but we've added another piece of the puzzle when it comes to our knowledge of the Earth's inner core.” While their data isn’t conclusive, it does correlate with other similar studies that have looked into the anisotropy of the Earth’s inner core. Stephenson said: “It's very exciting - and might mean we have to re-write the textbooks!” 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.

By Jonathan Stempel NEW YORK A New York appeals court on Tuesday signaled it was unlikely to grant

The White House and Congress could strike a deal to raise the debt ceiling in exchange for budget cuts

When this year's all-woman team arrived on Antarctica's Goudier Island to run the world's most remote post office, it was shovels they needed rather than stamps.

ROME The Italian government on Tuesday announced a crackdown on the use of electric scooters on city streets,

Tristan Tate said, 'A 14-year-old and a 1-year-old have gone missing, and as we speak, police resources are being used to watch and listen to me'

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The father of Tennessee Titans cornerback Caleb Farley has died after an explosion and collapse of a North Carolina home that injured one other person, according to authorities.

Richard Allen has been charged with two counts of murder in the February 2017 deaths of Abby Williams and Liberty 'Libby' German

Ukraine’s forces have “gained a foothold” on the eastern bank of the Dnipro River in a significant step for Kyiv’s counteroffensive, but Russia says they are raining “hell fire” on the troops. Ukrainian President Volodymyr Zelensky’s chief of staff said on Tuesday that Ukrainian forces had crossed onto the east bank of the river in the Kherson region “against all odds”. The river has been one of the key battlegrounds of the conflict, with Russia crossing from the eastern bank to seize Kherson city in the early days of the invasion only to abandon the regional capital late last year. Though they lost ground in the area and retreated back across the river, Russia has maintained a consistent troop presence on the eastern bank, hemming in the Ukrainian counteroffensive. The Russian military said it had pinned down Ukrainian forces who crossed onto the eastern bank of the River Dnipro is raining “hell fire” on them. They said that the average life expectancy of a Ukrainian soldier there is around two days. “The enemy is trapped in (the settlement of) Krynki and a fiery hell has been arranged for him: bombs, rockets, heavy flamethrower systems, artillery shells, and drones,” said Vladimir Saldo Read More Russia admits Ukrainian troops crossed Dnipro river but says ‘fiery hell’ awaits them Putin could face new war crime case as evidence suggests starvation of Ukraine was pre-planned Ukraine troops applying pressure on Putin’s forces having gained foothold along Dnipro River, says Kyiv Bombs, betrayal and burying loved ones: Plight of one Ukraine village illustrates toll of Russia’s invasion

By Lauren Owens Lambert MONHEGAN ISLAND, Maine An emerging technology to fish for lobsters virtually ropeless to prevent