Hydrometer submerged in water
The hydrometer is designed to measure a density of liquids. The density is shown the liquid surface on the hydrometer's scale.
Hydrometer presented in the picture looks like a broken one - part of it visible above the water surface seems to be disconnected. This is an effect of refraction.
Pluto's Story
- 1930: We have a new planet! ("New York Times")
- 2008: Why is Pluto no longer a planet? ("Universe Today")
- 2014: Wait, what? Pluto a planet again? ("USA Today")
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