Answer:
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Vegetable oil. Oil isn’t soluble in water, if layered properly it will float on top of the water in a beaker as you so mentioned. This is due to surface tension and density and a slew of other things I’m not intelligent enough to describe.
Could you say the sun rises in the east ? I’m not too sure though
1. Similarity to humans
2. Advanced interpretations and knowledge
3. Some of the smartest primates
