On this week’s best of Quirks & Quarks, we revisit our annual holiday listener question show, with fascinating queries like:

• Why did a Canadian astronaut's eyesight change when she went to space? 
• How is the dust inside our homes changing? 
• Why do some professional athletes stick out their tongues when they play?
• Why are most fruits round, but bananas and pineapple are not? 
• What would have happened if the dino-killing asteroid never struck Earth?

We'll satisfy all these scientific curiosities and many more!