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Bubbles (supersaturation): Why do little bubbles form along the bottom
and the sides of a cup when carbonated drinks are poured into it?
Bubbles: Why does beer fizzle when you add salt?
Enzymes: Are enzymes alive?
Flavor: Is there a weight to flavour? Some smells and tastes are
stronger than others. Does that mean that they are heavier?
Green eggs: Why do the yolks of overcooked boiled eggs become green?
Hard water: I was wondering what the difference is between hard and
soft water. Why does it feel "cleaner" after a hard water shower versus soft? I
still feel there is soap on me after using soft water. Also, is there any
advantage of one over the other?
Heavier elements: In your Q&A about where oxygen comes from, you
said the elements up to iron come from the thermonuclear furnaces of stars.
Iron, however, doesn’t give up energy, which causes the star to collapse.
Right? Well, where do all the other heavier elements (like uranium) come
from?
Hydrogen peroxide: How does hydrogen peroxide "know" germs when it
comes into contact with them? Peroxide doesn't fizz if you pour it on uncut
skin, so it's apparently not reacting to simple dirt or oils. But, it fizzes up
a storm if it contacts germs, such as in an infected cut.
Hydrothermal vents: Where does the energy come from that sustains
life around the ocean’s hydrothermal vents?
Oxygen:
Where does oxygen come from?
Oxygen: In your answer about where oxygen comes from you show a picture of a "ring" of
matter formed by a supernova. Shouldn't matter ejected by an explosion form a
spherical "ball" or "shell" rather than a "ring"?
Oxygen: I wonder what viewing device, in theory, would have high
enough resolution to detect the movement of nitrogen and oxygen molecules? Could
radar be used or would it take higher frequencies, like X-rays?
Soap: How does soap break down bacteria?
 Vitamins:
What does a vitamin look like?
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