The bombers of the Alfred P. Murrah Federal Building in Oklahoma City were

The bombers of the Alfred P. Murrah Federal Building in Oklahoma City were  Timothy McVeigh and Terry Nichols.

Explanation:

The Oklahoma City bombing was a terrorist attack carried out on April 19, 1995. The attack destroyed the Alfred P. Murrah Federal Building in Oklahoma City by a car bomb. 168 people were killed and more than 680 injured; 19 of the dead were children. Timothy McVeigh and Terry Nichols, supporters of the right-wing militia movement, were later convicted of the act.  

McVeigh said the motives for the deed were the authorities' strike on Ruby Ridge in 1992 and the siege in Waco in 1993 and to defend the freedom of every American citizen. The Oklahoma City bombing was carried out on the second anniversary of the Waco siege, which ended with the authorities attacking the ranch and most of the sect members, including many children, dying in an explosive fire.

whole lotta ptsd going on

answer:   migrations were important in the neolithic period. "two major migrations passing through southeastern europe were confirmed by the means of archaeo-genetic studies."

the first migration was the early neolithic period -- 6,000 before common era (bce) -- when the first farmers, from anatolia -- asia minor -- spread through europe. the second migration occurred during the early bronze age (3,000-2,500 bce) when the so-called "steppe population," from the eurasian steppe, replaced much of northern europe's previous population.

the first farmers of northern and western europe passed through southeastern europe with limited hunter-gatherer genetic admixture, which occurs when two or more previously isolated populations begin interbreeding. however, some groups that remained mixed extensively -- without the male-biased, hunter-gatherer admixture that prevailed later in the north and west, according to latest discoveries. southeastern europe continued to be a nexus between east and west, with intermittent genetic contact with the steppe people up to 2,000 years before the migrations that replaced much of northern europe's population.

"in some places, hunter-gatherers and incoming farmers seem to have mixed very quickly," says iain mathieson, a geneticist at the university of pennsylvania, who was first author of the paper. "but, mostly, the two groups remained isolated, at least for the first few hundred years. these hunter-gatherers had been living there for thousands of years, and it must have been quite a shock to have these new people show up -- with a completely different lifestyle and appearance."