Q: Autogyros and helicopters were used during World War II. List includes prototypes.
Can we conclude that were there helicopters in the second world war?
A: yes

Q: Tsunamis affecting the British Isles are extremely uncommon, and there have only been two confirmed cases in recorded history. Meteotsunamis are somewhat more common, especially on the southern coasts of England around the English and Bristol Channels.
Can we conclude that is it possible for the uk to have a tsunami?
A: yes

Q: ''Over the Rainbow'' is a ballad, with music by Harold Arlen and lyrics by Yip Harburg. It was written for the movie The Wizard of Oz and was sung by actress Judy Garland, in her starring role as Dorothy Gale. It won the Academy Award for Best Original Song and became Garland's signature song, as well as one of the most enduring standards of the 20th century.
Can we conclude that did judy garland sing somewhere over the rainbow?
A: yes

Q: Scientists traditionally thought that the variation in the size of raindrops was due to collisions on the way down to the ground. In 2009 French researchers succeeded in showing that the distribution of sizes is due to the drops' interaction with air, which deforms larger drops and causes them to fragment into smaller drops, effectively limiting the largest raindrops to about 6 mm diameter. However, drops up to 10 mm (equivalent in volume to a sphere of radius 4.5 mm) are theoretically stable and could be levitated in a wind tunnel. The largest recorded raindrop was 8.8 mm in diameter, located at the base of a cumulus congestus cloud in the vicinity of Kwajalein Atoll in July 1999. A raindrop of identical size was detected over northern Brazil in September 1995.
Can we conclude that is every drop of water the same size?
A:
no