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A fridge or freezer can preserve food for weeks, months or years. But that’s nothing compared to glaciers, with layers of ice preserving information about Earth’s climate for thousands of years.

In Australia, the year is off to a sizzling start. Much of the continent has been sweltering under a record-breaking heatwave. Let’s look at what’s causing these extreme temperatures.

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.