The sky is one of the most beautiful and mysterious parts of our natural environment. On a clear day, we can look up and see a vast expanse of blue stretching out before us. But why is the sky blue? This question has puzzled scientists and non-scientists alike for centuries,Read More →

Or Graur, University of Portsmouth Will time ever stop? – Casandra, aged 11, Epsom, UK Time began when the universe did. How – and if – the universe ends will determine whether time will end as well. We think the universe started out squeezed into an infinitely small space. ForRead More →

Mario Borunda, Oklahoma State University Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to Why does gravity pull us down and not up? – Gracie, age 9, Brookline, Massachusetts Gravity is the reason thingsRead More →