Struggling for Christmas gifts? Here are two books that could have a life-changing impact on whoever reads them. And, both of them are available right now for free.

1) Doing Good Better: Everyone wants to make a difference. One of the easiest ways to do this is to donate to a cause you believe in, or buy ethical products, or directly help someone in need.

However, more often than not, our decisions on who to support are based on emotion, assumptions or personal connections. The result often has less impact compared to what could be if we contributed to something based on proof of impact.

This book challenges us to think differently and demonstrates that with evidence and reasoning we can make a bigger impact with the same resources. It is based on the philosophy of effective altruism, something I have written about before here.

If you miss the free window, buy it anyway (only $10), all author profits are donated to effective charities.

2) 80,000 Hours: This is a subject I have written about before as well. It is estimated that you have about 80,000 hours in your career, which makes choosing your career is one of the most important decisions you’ll ever make. This book is a guide with over 5 years of research that aims to help you find a career you enjoy, you’re good at, and that tackles the world’s most pressing problems.

Again, if you miss the free window, I highly recommend you buy it anyway.

Merry Christmas everyone!