← archive

Question for:

On June 30, 1908, there was a massive explosion (witnessed only by a few reindeer herders of the local Evenki people) in a remote part of Siberia called Tunguska that produced forest fires and trees blown over for miles. The first scientific expedition did not reach the area until nearly 20 years later. Many years after that, the United Nations claimed June 30 as "International [BLANK] Day" in 2015, which was co-founded by Brian May, the lead guitarist of Queen. What word fills in the blank?

Clues