Data is all around us. It has become an essential asset for anyone who needs to make better decisions, whether we want to choose our children's school or decide what vacuum cleaner to buy. Anything relevant to us can benefit from a quantitative look that is revealing, valuable and often counter-intuitive. Think Clearly by Kiko Llaneras aims to help us think better. How? By compiling, explaining and illustrating dozens of useful ideas and shortcuts. It teaches us to avoid reasoning while recounting a bunch of eloquent examples: • How did Barack Obama make decisions and sleep so peacefully when he was president? • What ridiculous prejudice thwarted Marc Gasol's signing by the Houston Rockets in 2007? • Why did we know that vaccines would work against COVID-19? And why are so many soccer players born in January? It is a text with a practical motivation, because exercising your quantitative look is effective, but it is also a way to find a peculiar form of beauty.