The best microscope photos of the year reveal a strange and hidden universe in astonishing detail

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A fluorescent photo of a turtle embryo took first place. The photographers stacked and stitched together hundreds of images to fully capture every detail.

A fluorescent photo of a turtle embryo took first place. The photographers stacked and stitched together hundreds of images to fully capture every detail.
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A trippy image of three stentors, a type of single-celled protozoa that lives in freshwater and feeds on algae, snagged second place.

A trippy image of three stentors, a type of single-celled protozoa that lives in freshwater and feeds on algae, snagged second place.
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A photo showing a fluorescent alligator embryo came in third. The picture was taken just 20 days into the creature's development, as nerves and a skeleton formed.

A photo showing a fluorescent alligator embryo came in third. The picture was taken just 20 days into the creature's development, as nerves and a skeleton formed.

Here are the rest of the top 20 selections, followed by 20 of our personal favorites:

4. The bushy antennae of a male mosquito.

4. The bushy antennae of a male mosquito.
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5. A crystal-clear snowflake.

5. A crystal-clear snowflake.

6. The soul-piercing eyes of a small spider covered in white hair.

6. The soul-piercing eyes of a small spider covered in white hair.
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7. The pollen-releasing stamen of a Chinese red carnation.

7. The pollen-releasing stamen of a Chinese red carnation.

8. A frozen water droplet magnified eight times.

8. A frozen water droplet magnified eight times.
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9. A tulip bud, sliced open to show the petals and stamen curled inside.

9. A tulip bud, sliced open to show the petals and stamen curled inside.

10. Cells from the pulmonary artery of a young cow undergo the telophase stage of mitosis, in which they form two nuclei before dividing into two new cells.

10. Cells from the pulmonary artery of a young cow undergo the telophase stage of mitosis, in which they form two nuclei before dividing into two new cells.
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11. The ovaries of a fruit fly. The protein filament F-actin is stained yellow, nuclei are green, and follicle cells are magenta.

11. The ovaries of a fruit fly. The protein filament F-actin is stained yellow, nuclei are green, and follicle cells are magenta.

12. A squirming mosquito larva.

12. A squirming mosquito larva.
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13. Cuprite, a mineral composed of copper oxide.

13. Cuprite, a mineral composed of copper oxide.

14. A female lynx spider.

14. A female lynx spider.
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15. A pregnant freshwater crustacean called Daphnia magna.

15. A pregnant freshwater crustacean called Daphnia magna.

16. A housefly's eye, magnified 50 times.

16. A housefly's eye, magnified 50 times.
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17. A crystal of ascorbic acid, also known as vitamin C, reveals fascinating structures under a microscope.

17. A crystal of ascorbic acid, also known as vitamin C, reveals fascinating structures under a microscope.

18. A crystal of cristobalite suspended in quartz.

18. A crystal of cristobalite suspended in quartz.
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19. A California two-spot octopus embryo.

19. A California two-spot octopus embryo.

20. Blood vessels in a mouse heart after it suffered a heart attack.

20. Blood vessels in a mouse heart after it suffered a heart attack.
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In addition to those winners, 15 photos got honorable mentions. Here are the best ones, starting with this image of a moth wing.

In addition to those winners, 15 photos got honorable mentions. Here are the best ones, starting with this image of a moth wing.

Mold grows on a plum seed.

Mold grows on a plum seed.
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A blend of vitamin C crystals and sugar.

A blend of vitamin C crystals and sugar.

A fossilized ammonite: a sea creature that went extinct around 66 million years ago.

A fossilized ammonite: a sea creature that went extinct around 66 million years ago.
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Amino acids, the building blocks of proteins and life, crystallized under a microscope.

Amino acids, the building blocks of proteins and life, crystallized under a microscope.

Dozens more fantastic photos received recognition from the judges as "images of distinction." This one show eggs inside a brine shrimp.

Dozens more fantastic photos received recognition from the judges as "images of distinction." This one show eggs inside a brine shrimp.
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A cereal rye leaf curls around its stem.

A cereal rye leaf curls around its stem.

A tiny daphnia, a crustacean also known as a water flea.

A tiny daphnia, a crustacean also known as a water flea.
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Karlsbad Sprudelstein, a type of sedimentary rock.

Karlsbad Sprudelstein, a type of sedimentary rock.

A single-celled organism called Paramecium caudatum, which had been fed yeast cells stained with red dye.

A single-celled organism called Paramecium caudatum, which had been fed yeast cells stained with red dye.
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Molten caffeine.

Molten caffeine.

The deer-like antennae of a Haplomalachius flabellatus insect.

The deer-like antennae of a Haplomalachius flabellatus insect.
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A mouse's mammary gland, which was grown in a lab.

A mouse's mammary gland, which was grown in a lab.

The threads of a striated muscle cell in heart tissue, which was developed from a human stem cell.

The threads of a striated muscle cell in heart tissue, which was developed from a human stem cell.
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The magnified surface of a seed.

The magnified surface of a seed.

The sporangia structures that produce spores, tucked inside the leaf of a lady fern.

The sporangia structures that produce spores, tucked inside the leaf of a lady fern.
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A bearing from a mechanical watch.

A bearing from a mechanical watch.

Myoepithelial cells wrapped around milk-producing sacs in a mouse's mammary gland.

Myoepithelial cells wrapped around milk-producing sacs in a mouse's mammary gland.
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A single-celled algae called Triceratium morlandii.

A single-celled algae called Triceratium morlandii.

An ornate crystal of methylsulphonal, an organic sulfur compound.

An ornate crystal of methylsulphonal, an organic sulfur compound.
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