Puzzle 15

Symmetrical curve with two branches.

National trees of Iran and Bhutan.

Student of Plato, tutor of Alexander the Great.

Month in which the Berlin Marathon is usually held.

Gaps between two notes played together, in music.

Author of You Can Heal Your Life self-help guide.

Puny types, with no strength or morals.

Berlin's iconic airport that closed in 2008.

Suede ankle footwear of the 1980s.

German iced coffee.