Used dental floss
Eyelash hairs magnified 50 times.
Shark skin
Human sperm.
Paper
Toothbrush bristle
Glue
Lipstick
Tapeworm head viewed under an electron microscope.
Snail shell
Marijuana under an electron microscope.
White chalk
Household dust containing long hairs such as cat fur, twisted synthetic and woolen fibers, a pollen grain, plant and insects. Magnified 115 times.
Velcro
The surface of a silicon microchip.
Cigarette paper. The blue crystals are additives that keep the lit cigarette burning by producing oxygen.
The face of a mosquito, magnified 160 times.
A human head louse clings to a strand of hair.
The surface of a rusty nail.
Kidney stones under an electron microscope.
Tadpole
Sea water
A maggot
Apple stem
A worm
A blade of grass.
A caterpillar
A human tongue
Human tongue from another angle
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It's the psychoactive ingredient, but I wouldn't go so far as to call it 'good'.