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Difficulty: Fun The number 39 bus was packed as it pulled into the interchange. Then 37 people got off, and another 14 got on. As the bus left the interchange, there were 37 people on board. How many people were on the bus as it pulled into the interchange?

Cats are quiet and sneaky. When they’re out of sight, it’s almost impossible to keep tabs on them. But what about the other way around – does your cat know where you are, even when you’re out of sight?

Here’s a bite-sized quiz for you to sink your teeth into! Time to use your noodle to answer these questions.

By Rachel Rayner Dr Keith Bannister knew from an early age he wanted to do something technical with his life. The bedroom floor of his childhood home was usually littered with wires, screws, nuts and bolts.

Difficulty: Extreme! Ziqi’s teacher loved puzzles, and posed a difficult challenge: “Draw five dots on a piece of paper. Now, connect each dot to every other dot. Each pair of dots needs to be connected by a line, which doesn’t need to be straight.”

By David Shaw and Domonkos Szabo The Parkes radio telescope, turned 60 this week! To celebrate, why not make a model of The Dish?

This quiz has a leafy theme. Can you get the high score, or will it leave you heartbroken?

By Patrick Mahony Have you ever been surprised by a static shock? This clever device can measure electrical charge!

This quiz is all about fibres. From fabric to food, there’s plenty of fibre to chew over!

By Cordelia Jerjen Aquatic bugs use bubbles to breathe underwater. But this natural mechanism for underwater breathing has never been thought possible in vertebrates (animals with a backbone). In a first-of-its kind discovery, scientists have found that anoles – a type of semi-aquatic lizard – share this trick.