Ruben Verwaal

Ruben Verwaal is a Dutch author and historian. He is best known for his book 'Bloed, zweet en tranen' which explores the history of human body fluids. Verwaal has a background in history and has written several books on the subject. He is a popular speaker and has given lectures on the topic of human body fluids in various institutions. Verwaal is active on social media and has a strong online presence. He is based in the Netherlands.