Welcome to the wonderful world of Dr Karl: where oddities are embraced, facts reign supreme, curiosity is king and brightly coloured shirts are compulsory! In 50 Shades of Grey Matter, Australia's National Living Treasure Dr Karl Kruszelnicki applies his trademark straight-talkin'-no-high-falutin' scientific sense to a brand new range of Big Questions that you never knew you even wanted to ask, but now desperately need to know the answers to. Have you ever walked into a room and immediately forgotten the reason you're there? A solid thought convinced your legs to move, but by the time you reach your destination, you realise the thought has abandoned you en route. No, it's not dementia. It's the doorway. Impress your friends (and potential dates) by being able to answer such questions as: . Why is the sky is blue? . Why is it dark at night? . Why does lunacy erupt under a full moon? . What's the truth about spinach and Popeye? In this ever-changing, fast-paced and sometimes crazy world, few things are certain. But what is certain is that Dr Karl is here to help us battle our way through half-baked scientific myths and rumours, so that we may emerge smarter, stronger and viewing the world with more wonder than ever before.