Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...
Discover the science behind seeing your reflection in water. Light travels in straight lines and bounces off smooth surfaces, ...
Can we turn back time? Ask a savvy physicist, and the answer will be “it depends.” Schemes for retrograde time travel abound but usually involve irreconcilable paradoxes and rely on outlandish ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback