When we raised the flaps on those that Cheryl had brought along, we could see the roots of the various plants. With the candle lit in a darkened room it appears fairly bright - the only source of light. During the day, the sky is so much brighter than stars, we can't see the stars. The diaphragm in the body causes air to be pushed out or pulled in, and as the air rushes past the vocal chords, the chords vibrate, and so then does the air. The vocal cavity modifies sound which leaves the mouth.
Women have shorter vocal chords than men, resulting in higher pitch sound.
There are notable exceptions. Detergent breaks up the oil, but doesn't absorb any. Handout on the Solar System and Astronomy, Adler Planetarium. It seems very heavy, and is especially hard to turn. Placed on a table, it balances like a large top.