Some I have found useful:
Behave (2017) by Robert Sapolsky - attempting to explain why we behave as we do, involving so many aspects of being human
Sapiens: A Brief History of Humankind (2015) by Yuval Noah Harari - from insignificant and more primitive ape to being the one exceptionally advanced ape
Homo Deus: A Brief History of Tomorrow (2016) by Yuval Noah Harari - following on from the previous book, where we might be headed
A Brief History of Everyone Who Ever Lived (2017) by Adam Rutherford - what our genes, and the history of such, reveal about us
The Bonobo and the Atheist (2014) by Frans de Waal - exploring any biological basis for morality
Guns, Germs, and Steel (1997) by Jared Diamond - proposing how geographical and environmental factors have shaped the modern world
The World Until Yesterday: What Can We Learn From Traditional Societies? (2012) by Jared Diamond - Advancing the view that there is still much to learn from earlier societies that might have been ignored in the rush for progress, and plenty of detail to munch over
The Moral Animal: Why We Are The Way We Are (1994) by Robert Wright - an approach to such via evolutionary psychology. Much to learn about Darwin here too (as a person and his struggles), since his work is used as context to explain and discuss much human behaviour
From Bacteria to Bach And Back: The Evolution of Minds (2017) by Daniel Dennett - a possible explanation for the evolution of consciousness
Religion Explained: The Evolutionary Origins of Religious Thought (2001) by Pascal Boyer - approaches the subject via evolutionary biology and cognitive psychology. Not an easy read, and a bit mixed as to what I might have got from this - which reflects the reviews. This, from Nature.com, perhaps sums up my views - Some form of religious thinking seems to be the path of least resistance for our cognitive systems. By contrast, disbelief is generally the result of deliberate, effortful work against our natural cognitive dispositions — hardly the easiest ideology to propagate.
Life 3.0 (2017) by Max Tegmark - an exploration into how AI might develop and the likely problems associated with such
Survival of the Prettiest: The Science of Beauty (1999) by Nancy Etcoff - a psychologist argues that our concept of beauty is in our biology rather than being a construct