Yoga began in South Asia about 5,000 years ago. It has grown in popularity, especially in the US, India and China, and today, some 300 million people around the world practice yoga.

Becoming a botanist was a natural career path for Robin Wall Kimmerer, a Potawatomi citizen. The professor of environmental biology and best-selling author grew up in upstate New York, where she loved to wander through the countryside and forests.

The world's food supply has relied on conventional farming for the best part of a century. But its extensive use of pesticides, herbicides, and fertilizers is having an impact on greenhouse gases, biodiversity and possibly human health.