Tania Lombrozo

Last Saturday, tens of thousands of people across the country joined the March for Science, an event that the official website described as "the first step of a global movement to defend the vital role science plays in our health, safety, economies, and governments."

We make dozens of decisions on a daily basis: what to have for breakfast, which task to complete first, which article to read.

Most of these decisions are easy.

But then there are the hard decisions — the ones we agonize over, the ones that lead to sleepless nights. These decisions are hard for two reasons: because no single option clearly dominates the alternatives, and because we expect our choice to have significant consequences. It's these two elements that explain why hard decisions should be easy — but are not.

Let's start with the first reason.

As an undergraduate, I majored in philosophy — a purportedly useless major, except that it teaches you how to think, write and speak.

Calling someone a "skeptic" can be a term of praise or condemnation.

Too often, it expresses approval when the target of skepticism is a claim we reject, and disapproval when the target is a claim we hold dear. I might praise skepticism towards homeopathic medicine, but disdain skepticism towards human evolution. Someone with a very different set of beliefs might praise skepticism regarding the moon landing, but disdain skepticism regarding the existence of God.

March 20 is the International Day of Happiness, the result of a UN resolution adopted in 2012 that identifies the pursuit of happiness as "a fundamental human goal" and promotes a more holistic approach to public policy and economic growth — one that recognizes happiness and wellbeing as important pieces of sustainable and equitable development.

Young kids are known for exploration and explanation; they poke and they prod, they open and push, they ask: "Why? Why? Why?"

This Sunday, Feb. 12, is Darwin Day, an international day of celebration commemorating the birth of Charles Darwin and his contributions to science.

It's also an excuse for science- and evolution-themed events around the globe, and for all of us to take a moment to appreciate the value of science and the wonders of the natural world.