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THE LAST 500 YEARS HAVE WITNESSED A breathtaking series of revolutions. The earth has been united into a single ecological and historical sphere. The economy has grown exponentially, and humankind today enjoys the kind of wealth that used to be the stuff of fairy tales. Science and the Industrial Revolution have given humankind superhuman powers and practically limitless energy. The social order has been completely transformed, as have politics, daily life and human psychology. But are we happier? Did the wealth humankind accumulated over the last five centuries translate into a new-found contentment? Did the discovery of inexhaustible energy resources open before us inexhaustible stores of bliss? Going further back, have the seventy or so turbulent millennia since the Cognitive Revolution made the world a better place to live? Was the late Neil Armstrong, whose footprint remains intact on the windless moon, happier than the nameless hunter-gatherer who 30,000 years ago left her handprint on a wall in Chauvet Cave? If not, what was the point of developing agriculture, cities, writing, coinage, empires, science and industry? Historians seldom ask such questions. They do not ask whether the citizens of Uruk and Babylon were happier than their foraging ancestors, whether the rise of Islam made Egyptians more pleased with their lives, or how the collapse of the European empires in Africa have influenced the happiness of countless millions. Yet these are the most important questions one can ask of history.

Sapiens

Yuval Noah Harari

Below are a few that subsequently worked well for me. Note that I don’t need to satisfy all of them, but I do want to satisfy most of them: If it has a single founder, the founder must be technical. Two technical co-founders are ideal. I must be eager to use the product myself. This rules out many great companies, but I want a verified market I understand. Related to the previous point: consumer-facing product/service (e.g., Uber, Twitter, Facebook, etc.) or small-business focused product/service (e.g., Shopify), not big enterprise software. These are companies whose valuations I can directly impact through my platform, promotion to my audience, introductions to journalists, etc. More than 100K active users OR serial founder(s) with past exits OR more than 10K paying customers. Whenever possible, I want to pour gasoline on the fire, not start the fire. More than 10% month-on-month activity growth. Clean “cap table,” minimal previous financing (or none), no bridge rounds. U.S.–based companies or companies willing to create U.S.–based investable entities. Shopify started in Canada, for instance. Have the founders ever had crappy service jobs, like waiting tables or bussing at restaurants? If so, they tend to stay grounded for longer. Less entitlement and megalomania usually means better decisions and better drinking company, as this stuff normally takes quite a few years.

Tools of Titans

Timothy Ferriss

The physicist lay quietly on the ground, his eyes still open as blood oozed from his head. The frenzied crowd sank into silence. The only thing that moved was a thin stream of blood. Like a red snake, it slowly meandered across the stage, reached the edge, and dripped onto a chest below. The rhythmic sound made by the blood drops was like the steps of someone walking away.

The Three-Body Problem

Cixin Liu and Ken Liu

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