Tania Lombrozo

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.