Saudi Arabia plans to build six-runway airport
1st December - "Easier"
Saudi Arabia has announced a plan to build a huge airport.
'Hated' Australian bird dealing with invasive species
28th November - "Harder"
Australia's white ibis bird has learnt how to kill a damaging invasive species.
Work starts on beaming solar energy from space
24th November - "Easier"
Huge solar farms in space could provide millions of homes with clean energy.
Cooking began 600,000 years earlier than we thought
21st November - "Harder"
New research suggests that using fire to cook food started 600,000 years before previously thought.
Our Sun will die in 10 billion years from now
17th November - "Easier"
Scientists have worked out when our Sun will die. It won't be any time soon. It will be in 10 billion years.
Tunnel under Egypt could lead to Cleopatra's tomb
14th November - "Harder"
Archaeologists believe they have unearthed a tunnel that could lead to Queen Cleopatra's tomb
Billionaires create a million times more CO2
10th November - "Easier"
The average billionaire is responsible for a million times more CO2 than the average person creates.
Hygiene poverty on the rise in the U.K.
7th November - "Harder"
Millions of people can no longer afford essential hygiene products, like soap.
Bees like playing with balls, study finds
3rd November - "Easier"
Scientists have discovered that bees like to play with balls.
World record gathering of people with same name
31st October - "Harder"
A group of 178 Tanaka Hirokazus broke the world record for the largest gathering of people with the same first and last name.
Anti-cheating exam hats used in Philippines college
27th October - "Easier"
A college is getting students to make and wear anti-cheating hats during tests.
Congo gold mining threatening endangered species
24th October - "Harder"
Gold mining in a national park in the Democratic Republic of Congo is putting at risk an animal called the okapi.
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