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Roof has been transferred to death row at a facility that houses most male inmates awaiting execution under the federal government.

Roof has been transferred to death row at a facility that houses most male inmates awaiting execution under the federal government.

Roof has been transferred to death row at a facility that houses most male inmates awaiting execution under the federal government.

Murthy, 39, said his appointment under Obama to the post was a humbling experience. He is being replaced by Rear Adm. Sylvia Trent-Adams.

Scientists and conservationists said such drastic increases in border security could be devastating for hundreds of species.

Scientists and conservationists said such drastic increases in border security could be devastating for hundreds of species.

Many in the Berkeley community feel that recent clashes have turned their city into a powder-keg on the brink.

Many in the Berkeley community feel that recent clashes have turned their city into a powder-keg on the brink.

Many in the Berkeley community feel that recent clashes have turned their city into a powder-keg on the brink.

Scientists are gathering in Washington, D.C., and in more than 600 cities around the world for the March for Science. The Earth Day event intends to draw attention to political and funding issues impacting the science fields. Speakers include television host Bill Nye, artist Maya Lin, as well as numerous leading academics. Watch the full program on NBCNews.com.