Despite consisting only of one single cell, the microorganism Paramecium has an amazingly complex life cycle. It has a period of infancy and of old age, it learns, defends itself from prey, has sex, responds to different sensory cues - all things we can relate... click to read more

Roughly speaking, our bodies use energy from the sun, but we can't use sunlight directly. Instead, plants and algae collect sunlight and store it as chemical energy through the process of photosynthesis. We can access that fuel directly when we eat plants, or indirectly when... click to read more