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It turns out that the world is about 4,600,000,000 years old. That’s 4.6 billion years. That’s pretty old! Marcella Cheng/The Conversation

Curious Kids: How do scientists work out how old the Earth is?

The world is made of tiny building blocks called 'elements'. Scientists have worked out how fast some elements change into other elements. That gives us a very big clue about how old the Earth is.
Americans heard about atomic bombs long before one was actually built. US Department of Defense

Even before Hiroshima, people knew the atomic bomb

News of the Hiroshima bombing spread quickly to the US public but, thanks to science fiction writers, atomic bombs were discussed more before the war began than during it.
For years, Australia has been looking at remote Indigenous land to store its nuclear waste. But now that Muckaty is off the table, it’s time to consider big city locations. Caddie Brain/Flickr

Nuclear waste is safe to store in our suburbs, not just the bush

Right now, radioactive material is stored at more than 100 locations in cities and suburbs across Australia. Yet after the withdrawal of a proposed remote site for a “nuclear waste dump” at Muckaty Station…

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