January 19, 2019

Why do leaves change color in the fall?

Leaves are colored by molecules called pigments. The pigment that causes leaves to be green is chlorophyll. Chlorophyll is important for plants to make food using […]
January 19, 2019

Why do tumbleweeds tumble?

To set the mood for shootouts at high noon in old cowboy movies, of course. Actually, tumbleweeds tumble to create future generations of tumbling tumbleweeds. The […]
January 19, 2019

Why do flowers smell nice?

The fragrance or smell of the flower plays a very important role. Insects, birds, butterflies or animals do not come to the plant knowing that they […]
January 19, 2019

Why do cacti have spines instead of leaves?

These prickly plants have evolved to thrive in sunny deserts and sandy soils that would kill your average potted geranium in less than a day. You […]