{FD} Science of ‘The Meg’: How scientists know the world’s largest shark is gone forever

Picture a shark as long as a bowling lane, with teeth bigger than your hand and a bite as powerful as a T. rex’s. This toothy predator is called Megalodon. It was the biggest shark that ever lived and perhaps fortunately for us, it went extinct almost 3 million years ago.

{FD} Why Mars appears to be moving backward

Our solar system is in constant motion, with all eight planets and dwarf planet Pluto orbiting the sun. Most of those planets are visible from Earth, even to the...eye. If you track them in the sky night after night, you’ll notice that their position changes slightly; as they orbit the sun, they appear to move from west to east against a fixed backdrop of distant stars.