What makes the battle against microplastics so difficult? What’s the average age of the freighters navigating the world’s seas? What can private citizens use to produce drinking water? Delve into the oceanic world and test your knowledge.

What was the price of the most expensive NFT ever? What does "urban mining" actually mean? And how many pieces of debris do you think are hurtling through orbit? Test your knowledge in our tech quiz.

Does a greenhouse effect exist on Mars? How fast does the world’s fastest electric airplane fly? What will soon open in space? Aerospace is fascinating – go ahead and test your knowledge.