measuring the ratio of the amount of 40 Ar accumulated to the amount of 40 K remaining. The long half-life of 40 K allows the method to be used to calculate...

Arkansas Highway 40 may refer to: Arkansas Highway 40 (1926-1958), now numbered 140 Interstate 40 in Arkansas, created in the late 1950s This disambiguation...

The AR platform has become widely popular for makers of hunting and sporting rifles. Although the designations "AR-10" and "AR-15" are respectively trademarks...

US 49/AR 17 in Brinkley. Upon entering St. Francis County, I-40 runs northeast to Forrest City, where it intersects with AR 1. Continuing northeast, I-40 enters...

40 ljuva år! is a compilation album from Swedish dansband Lasse Stefanz released on 27 December 2006. The album reached number one on the Swedish album...

The 6mm AR is a centerfire wildcat cartridge initially designed by Robert Whitley for long-range performance in an AR-15 rifle. The cartridge uses a 6...

The ArmaLite AR-10 is a 7.62×51mm NATO battle rifle designed by Eugene Stoner in the late 1950s and manufactured by ArmaLite (then a division of the Fairchild...

Ruger AR-556 is a semiautomatic AR-15 style rifle manufactured by U.S. firearms company Sturm, Ruger & Co. Introduced in 2014 as an entry-level AR-15 using...

The ArmaLite AR-15 is a select-fire, gas-operated, air-cooled, magazine-fed rifle manufactured in the United States between 1959 and 1964. Designed by...

40 år i folkparkens tjänst is a 2013 Wizex compilation album, consisting of rerecordings. The album was released during the band's 40th anniversary year...