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
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.
Radiotherapy treats cancer by directing beams of high energy x-rays at the tumour.
Getting the right amount of radiation is a fine balance between therapy and harm. A common way to improve the benefit-to-cure ratio is to fire multiple beams at the tumour from different directions.
Drink image via www.shutterstock.com.
Back in the early 1900s, if you felt a bit sluggish you could reach for a beverage enhanced with radioactive elements to really add some pep to your step. It wouldn't be a healthy choice, though.
The policy failures behind the upbeat headlines.
Polonium is found naturally in uranium ore.
Polonium's chemical properties made it the ideal secret weapon for the assassins of Alexander Litvinenko.
Americans heard about atomic bombs long before one was actually built.
US Department of Defense
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.
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…