What's new

Posts by David

Two trains brainteaser Brainteaser

by David, 29 June 2022 | 0 comments

Brain icon

Difficulty: Fun A fast passenger train leaves Sydney Central station, headed for Broken Hill. At the same time, a slow freight train, moving at only half the speed of the passenger train, leaves Broken Hill station, headed for Sydney Central. When they meet, which train is closer to Sydney?

Continue reading Two trains brainteaser


Selling random numbers News

by David, 23 June 2022 | 0 comments

A scientist standing behind a complicated laser experiment

It sounds like a perfect way to make money – scientists from The Australian National University (ANU) are now selling random numbers over the internet! But before you start your own business writing whatever number pops into your head, there’s something special about these numbers.

Continue reading Selling random numbers

Build your own automatic fishing machine Activity

by David, 22 June 2022 | 0 comments

Illustration of a fish trap with netting across the river.

Here’s a chance to create your own automatic fishing machine inspired by Aboriginal engineering. Automatic fishing machines were, and may still be, used by Aboriginal people to catch fish in shallow waters. This activity is based on a fishing machine invented by Aboriginal engineers and used near the Murray River.

Continue reading Build your own automatic fishing machine


Too many elevens brainteaser Brainteaser

by David, 16 June 2022 | 2 comments

Brain icon

How many 1s does it take to write out the number eleven thousand, eleven hundred and eleven?

Continue reading Too many elevens brainteaser


It came from the sky! A quick quiz Quiz

by David, 15 June 2022 | 0 comments

We had our eyes on the skies as we wrote this quiz. Can you reach for the stars or are you coming back down to Earth?

Continue reading It came from the sky! A quick quiz

Big fingerprints Activity

by David, 9 June 2022 | 0 comments

Image of a fingerprint on the side of a balloon.

Have you ever wanted to know how experts identify fingerprints? This quick activity will make your fingerprints giant, to make clues easy to spot!

Continue reading Big fingerprints

Supersized seagrass: world’s biggest plant found in Western Australia News

by David, 8 June 2022 | 0 comments

Underwater picture of seagrass

Forget blue whales, redwood trees and aspen groves. There’s a new biggest organism in town. It’s a huge patch of seagrass, the size of about 20,000 rugby fields. And it’s been hiding in plain sight in Shark Bay, at the western tip of Western Australia!

Continue reading Supersized seagrass: world’s biggest plant found in Western Australia

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?

Continue reading Paying the miller brainteaser


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!

Continue reading Spotting quakes before the shakes

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!

Continue reading Soma cube