This is a mint 2017 USPS stamp sheet of 20 self adhesive FOREVER stamps showcasing 10 examples of Bioluminescent Life: the deep-ocean octupus, the midwater jellyfish, the deep-sea comb jelly, the mushroom, the firefly, the bamboo coral, the marine worm, the crown jellyfish, and a second type of marine worm. The pane contains 20 stamps, 2 of each design. At the center top, the selvage features a transparent deep-sea comb jelly surrounded by images of the firefly squid. Bioluminescent creatures use light to lure food, find mates, or to find off predators. The study of fireflies has provided scientists with easy means by which to investigate "living light". Using the genes that enable bioluninescence, scientists can now make a cancer cell glow, then track its function and reprodutction. Similar research is also vital to fighting Alzheimer's, Parkinson's, anemia, malaria, HIV, and many other diseases. Stamp sheet measures 7-1/4" x 7-1/4" . Mint condition. Shipping is $3.95 within the USA. International shipping rates apply. As always shipping is combined for multiple purchases. Please enjoy browsing the store for lots more STAMP COLLECTIONS often. Thanks for stopping by!