This week's free image is a bit of an experiment. In previous weeks, our free image has featured a puppy, a person, or an abstract image. This time around, it's straight forward science, with three beakers containing ... potions of mystery (oooooh!). The image would be a great addition to scholastic promotional materials, including continuing education programs. This week's free image comes to us from contributor Pedrosala, whose eco-conscious collection contains images of everything from windmills to solar panels.

For more images like this one, check out our full collection of scientific photos.