Nature & Animals
Why Do Cats Purr?
Cats purr as their vocal folds vibrate at about 25 to 150 Hz. They purr when content but also when stressed or hurt, and some hide a cry in the purr to get fed.
Nature & Animals
Animals, plants and ecosystems: how living things grow, behave, survive and change with the seasons, explained from field research.
Nature & Animals
How Do Bees Make Honey?
Bees turn flower nectar into honey by adding enzymes that split its sugar and drying out most of the water, then seal it in wax cells as food for winter.
Nature & Animals
Why Do Leaves Change Color in the Fall?
Leaves change color in fall when shorter days halt chlorophyll production, exposing yellow carotenoids and prompting red anthocyanins to form in the leaf.