The third book in a new smart-thinking series that applies complex biological ideas to everyday scenarios.What's the best way to study (according to neuroscience)? Can you trust your gut instincts? What is love - and is it all in your head? In this eye-opening exploration of the body's hidden intelligence, expert science writer Ken Okona-Mensah reveals how your everyday choices, emotions, and behaviors are shaped - often without your awareness - by complex biological systems. From the microbes in your gut, to the rhythms of your heart, Why Do I Get Butterflies In My Stomach? uncovers the unconscious biology driving everything from trust and attraction to disease, stress, and decision-making. Packed with strange-but-true facts, evolutionary oddities, and plenty of 'ohhh, so that's why' moments, this book reveals that biology isn't just something you learned in school - it's the hidden force behind how you're born, who you love, the friends you choose, and so much more.