When the City of Sydney’s public art plan for the newly revamped CBD was unveiled in 2014, the public response was mixed. There was a relatively muted reaction to Tracey Emin’s project that will see dozens of handmade bronze birds perched atop buildings and doorways, and outright derision from some quarters at the concept of an...

This is an article from Curious Kids, a series for children. The Conversation is asking kids to send in questions they’d like an expert to answer. All questions are welcome – serious, weird or wacky!

Why it...

One of the most extreme climate episodes the Earth has experienced was during the so-called Snowball Earth, 720 million years ago. During this period glaciers spanned from the poles to the tropics, resulting in a planet entirely covered by ice.

The Snowball Earth...