Thousands of genes stick to each ball, and the combination is loaded into a "gene gun"--two small stainless-steel chambers and a vacuum pump--that uses compressed helium.

FORBES: Millions Served

Thousands of genes stick to each ball, and the combination is loaded into a "gene gun, " which consists of two small stainless steel chambers and a vacuum pump.

FORBES: Millions Served

"If you look at the combination of likelihood of passage and effectiveness of curbing gun crime, universal background checks is at the sweet spot, " Sen.

WSJ: Obama's Gun Curbs Face a Slog in Congress

"If you look at the combination of likelihood of passage and effectiveness of curbing gun crime, universal background checks is at the sweet spot, " said Sen.

CNN: Pushback on Obama's plan to stem gun violence

But Dennis Henigan, legal director of the Centre to Prevent Handgun Violence, replies that gun manufacturers already have access to low-tech safety devices, such as combination locks.

ECONOMIST: Anti-gun lawsuits (2)