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Say cheese and flash that beautiful smile. You should be proud of those choppers; after all, teeth have been around for nearly half a billion years.

It’s a small molecule, made of oxygen and hydrogen atoms in a V-shape. It’s colourless, odourless and expands when it freezes into a solid. It’s water, and without it, we wouldn’t be here.

You’re at home, sitting on the couch. Outside, there is thunder and lightning. You notice something at the window: a strange, glowing ball of light. As you watch, it appears to pass through the glass. It wanders through the air before abruptly disappearing.

Looking for something to do this weekend? Play the time walk board game. You can download and print the instructions, game pieces and  board. Let us know what you think! If you’re after more science fun for kids, subscribe to Double Helix magazine!

At school you receive report cards to keep track of how you’re going and to identify strengths and weaknesses. Report cards are good for students – what about our oceans?

Get ready to build your own paper model of the International Space Station (ISS).

About 70% of the world’s surface is covered by ocean. You don’t even need to live near the coast to be affected by the sea. The sea is an important source of food, its currents influence climate systems and a significant amount of the oxygen we breathe comes from phytoplankton in the ocean.

Sunday 8 January 2012 marked the 100th Anniversary of Douglas Mawson’s expedition arriving in Antarctica. This was the first of many research expeditions Australia would undertake to the frozen continent.