Puzzle 4

Least tasty.

The framing system inside all mammals.

Negative part of something with positive elements.

Black pan material made of more than 2% carbon.

One who illegally transports drugs or people.

__ Android, Radiohead's hit single of 1997.

Having the quality of endurance and empathy.

Plucked to create the perfect arches.

Referees blow them.

Place of particular interest in a city or town.

Someone who's single, cute and funny is this.

Warm bed coverings.

"Throw down the __" is to issue a challenge.

Personification of the United States.