Puzzle 15

Government policy research institute.

Anniversary 10 years before a centenary.

Band of wood touching the floor and the wall.

Male head of the family.

Looking for.

__ Army; worldwide Christian charity.

Principal cause of cholecystitis.

Vast Canadian body of water named after navigator.

Marine mammals in the weasel family.

Excursion for observation and research.

Alien __; extraterrestrial arrivals on Earth.

And it's no __, Elton John song title and lyrics.

Someone who flies newly built aircraft.

Monosodium __ (MSG), a salty food additive.

Monarch played by Olivia Colman.

No admission fee.

Something to devote energy to, often laborious.

F1 title-winner in 1976, adversary of Niki Lauda.