A Gnat aircraft flies past the tail fin of a Qatar Airways Dreamliner as it comes in to land at the 2014 Farnborough International Airshow in Farnborough, southern England July 13, 2014. REUTERS/Kieran Doherty (BRITAIN - Tags: TRANSPORT SOCIETY MILITARY)

Gnats, or small biting flies, gather on a bridge over the East Lake in Wuhan, Hubei province November 17, 2011. The high number of gnats near lakes is considered to be a consequence of water pollution and the gnats usually die once the temperature drops, according to experts, local media reported. REUTERS/Stringer (CHINA - Tags: ENVIRONMENT SOCIETY)

Gnats, or small biting flies, gather on railings of a bridge over the East Lake in Wuhan, Hubei province November 17, 2011. The high number of gnats near lakes is considered to be a consequence of water pollution and the gnats usually die once the temperature drops, according to experts, local media reported. REUTERS/Stringer (CHINA - Tags: ENVIRONMENT SOCIETY)

Anaheim Angels first base coach Griffin uses a shin guard to ward off gnats during game with the Cleveland Indians at Jacobs Field. Anaheim Angels first base coach Alfredo Griffin uses a shin guard to ward off gnats during game with the Cleveland Indians at Jacobs Field September 4, 2004. REUTERS/Ron Kuntz

Cleveland Indians umpire room attendant Jack Efta uses insect repellent to ward off gnats from home plate umpire Bill Miller. Cleveland Indians umpire room attendant Jack Efta uses insect repellent to ward off gnats from home plate umpire Bill Miller during game with the Anaheim Angels at Jacobs Field September 4, 2004. REUTERS/Ron Kuntz

Anaheim Angels Glaus calls time as a gnat gets into his eye during the game against the Cleveland Indians at Jacobs Field. Anaheim Angels Troy Glaus calls time as a gnat gets into his eye during the game against the Cleveland Indians at Jacobs Field September 4, 2004. REUTERS/Ron Kuntz

Cleveland Indians umpire room attendant Jack Efta uses insect repellent to ward off gnats from home plate umpire Bill Miller. Cleveland Indians umpire room attendant Jack Efta uses insect repellent to ward off gnats from home plate umpire Bill Miller during game with the Anaheim Angels at Jacobs Field September 4, 2004. REUTERS/Ron Kuntz

Democratic presidential candidate U.S. Senator John Kerry (D-MA) looks over a British "Follan Gnat" airplane on the tarmac of the Nantucket, Massachusetts airport July 17, 2004. Kerry is spending the weekend on the small island of Nantucket, off the coast of Massachusetts. REUTERS/Brian Snyder US ELECTION BS

Baltimore Orioles field attendant Ernie Tyler (L) sprays insect
repellent on home plate umpire Mark Hirschbeck at the start of the
fifth inning of the Orioles game against the Texas Rangers at Camden
Yards in Baltimore September 3, 2002. Gnats were flying over the
playing surface during the game. REUTERS/Joe Giza

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US President Bill Clinton brushes away gnats as he speaks to the press after the Group of Seven summit, June 29.

US President Bill Clinton speaks to the press as a swarm of gnats swarm overhead after the Group of Seven summit, June 29.