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Posts by David

Paying the miller brainteaser Brainteaser

by David, 2 June 2022 | 2 comments

Brain icon

A farmer goes to the local mill to get some wheat ground into flour. The miller doesn’t ask for money – instead, they take one tenth of the wheat as payment. If the farmer wants 100 kilograms (kg) of flour at the end, how much wheat should they bring?

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Spotting quakes before the shakes News

by David, 25 May 2022 | 0 comments

Photo of a seismograph needle recording vibrations

Every second counts when a big earthquake hits. As soon as an earthquake sensor picks up the tremor, warnings can be sent over the internet, much faster than the shake travels through the Earth. And now, scientists have found a way to detect big earthquakes fast, maybe even before the ground starts to shake!

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Soma cube Activity

by David, 24 May 2022 | 1 comments

A cube made of lots of dice

The soma cube is a tricky puzzle! First, you’ll glue some cubes together into strange shapes. Then see if you can get those shapes to come together!

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Diamonds are forever quiz Quiz

by David, 19 May 2022 | 0 comments

These clear, shiny gemstones are very valuable and oh-so-special. Can you sparkle like a diamond and get full marks on our quiz?

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Srinivasa’s street brainteaser Brainteaser

by David, 18 May 2022 | 0 comments

Brain icon

Difficulty: Extreme! Srinivasa lives in a house on a short street, with houses on one side. The houses are numbered 1, 2, 3 and so on. He was practicing his addition when he noticed something strange.

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Make a jumping jack Activity

by David, 12 May 2022 | 0 comments

Cardboard robot toy with moving arms and legs

This cardboard doll loves to leap! It takes a bit of crafting, but the results will make you jump for joy.

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Super jumping robot News

by David, 11 May 2022 | 3 comments

Jumping robot features two intercepting hoops with a small rocket on the top.

What on Earth can jump the highest? Olympic high jumpers can clear more than 2 metres. Pumas might be the best animals at jumping, able to leap 7 metres into a tree. But a team of researchers from the USA have just made a robot that jumps higher than any animal!

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Solo noughts and crosses brainteaser Brainteaser

by David, 5 May 2022 | 0 comments

Brain icon

Difficulty: Tricky Mabel wanted to play noughts (O) and crosses (X), but she didn’t have anyone to play with. So she just took one go after another. Somehow, Mabel put Xs in 6 of the 9 squares without making a line of 3 Xs. Can you draw the board and work out which squares have…

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Fungi chit-chat News

by David, 28 April 2022 | 0 comments

A lumpy yellow fungus with many wires poking into it.

When people talk about fungi, what do you imagine? Mushrooms and toadstools are instantly recognisable parts, but there are many types of fungi that grow in different ways.

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Half-brown banana Activity

by David, 27 April 2022 | 1 comments

a banana that is brown at one end

Unripe bananas are green, ripe ones are yellow and overripe bananas are brown. But can you make a banana that’s half brown and half yellow?

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