Aspirin ant aphid aspirin butterfly blood bloodclot brain tumor bread mold cockroach dog flea dust mite e-coli bacteria geranium pollen goldfish skin herpes virus honeybee house fly jumping spider kitchen sponge leaf leaf stoma Aspirin is acetisalicylic acid, in crystal form. lightbulb filament mold mosquito muscle cell paper (coarse) paramecium plaque & tartar ragweed pollen rose petal salt crystal sand flea skin (human) skin (shark) slime mold soil sperm spider's spinnerets staphylococcus streptococcus velcro vitamin C Images copyright Dennis Kunkel Microscopy, Inc. www.denniskunkel.com The Virtual Microscope | Using a Microscope Resources HTML, graphics & design by Bill Willis 2023