June 25, 2015 6:52 AM EDT

How do I get this stupid song out of my head?

Try chewing gum, which one study found led to a 60% reduction in thoughts about earworms

Which came first, the chicken or the egg?

Most scientists say the egg, which has been around for 100 million years

What’s the sexiest dance move?

Women believe that men who vary movements in their torso and neck are significantly better dancers

What does space smell like?

Astronauts have compared the smell to that of seared steak or hot metal

When does Marty McFly get here?

He arrives on Oct. 21, 2015

Why does squinting help you see better?

It decreases the amount of stray light that enters your eyes, which blurs your vision

SOURCES: QUARTERLY JOURNAL OF EXPERIMENTAL PSYCHOLOGY; EGG & NEST, BELKNAP PRESS; BIOLOGY LETTERS; NASA; UNIVERSAL PICTURES; CORNELL UNIVERSITY

This appears in the July 06, 2015 issue of TIME.

Contact us at letters@time.com.

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