Among the most intelligent animals on Earth, three species of hyenas still roam in wilder parts of Africa and Asia. Of them, the striped hyena and the brown hyena are most at risk. Both are considered “Near Threatened” by the International Union for the Conservation of Nature (IUCN), which maintains

Aside from the obvious physical safety considerations (especially when talking on a cell phone!), biking on highly trafficked roads exposes riders to considerable amounts of fine particles, nitrogen dioxide and volatile organic compounds spewing out of tailpipes.

Besides being more sanitary than toilet tissue, bidets—those squirty accessories so popular in Europe, Japan and elsewhere that clean your underside using a jet of water—are also much less stressful on the environment than using paper.