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In the gallium-germanium telescope laboratory, a worker crunches numbers near fish, which serve both as companions and as an early warning system in c...

One of the spaces at the Baksan Neutrino Observatory where experiments are performed, in Neytrino, Russia, April 11, 2018. For the last half-century,...

Employees of the Baksan Neutrino Observatory gather at its entrance to take an electric trolley thousands of feet underground to the facility's labora...

Horses graze on the slopes of Neytrino, Russia, April 11, 2018. For the last half-century, Neytrino's main business has been the study of the tiniest...

A bust of Lenin and a poster reading "Glory to Soviet Science," vestiges of the Baksan Neutrino Observatory's origins, in Neytrino, Russia, April 11,...

Valery Gorbachev, a senior researcher, sets up counters with radioactive isotopes of germanium, at the Baksan Neutrino Observatory in Neytrino, Russia...

Nail Khairnasov, the lead engineering technologist of the gallium-germanium telescope, at the Baksan Neutrino Observatory in Neytrino, Russia, April 1...

Nail Khairnasov, the lead engineering technologist of the gallium-germanium telescope, at the Baksan Neutrino Observatory in Neytrino, Russia, April 1...

Vintage computers keep track of events observed inside the Baksan Neutrino Observatory in Neytrino, Russia, April 11, 2018. For the last half-century,...

TOPSHOT - (FILES) In a file photo taken on April 10, 2018 students perform a taekwondo demonstration at the Mangyongdae Revolutionary School outside P...

Mandatory Credit: Photo by REX/Shutterstock (9766568y) Chris Van Hollen, Chairman of Campaign Committee, Democrat US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568z) Charles E. Schumer, Democratic Leader, Chairman of the Conference US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568x) Roy Blunt, Vice Chairman of the Senate Republican Conference US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568w) Richard C. Shelby, Appropriations Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568u) Mike Crapo, Banking, Housing and Urban Affairs Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568v) Lisa Murkowski, Energy and Natural Resources Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568t) Senator Johnny Isakson, Veterans's Affairs Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568s) Joe Manchin III, Vice Chair of Policy and Communications Committee, Democrat US Politicians -...

Mandatory Credit: Photo by REX/Shutterstock (9766568r) Senator Joe Hoeven, Indian Affairs Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568p) Mark R. Warner Vice Chair of Conference, Democrat US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568q) Cory Gardner, Republican Senatorial Committee Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568o) Richard J. Durbin, Democratic Whip US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568n) Senator James E. Risch, Small Business and Entrepreneurship Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568l) Debbie Stabenow, Chairwoman of Democratic Policy and Communications Committee US Politicians...

Mandatory Credit: Photo by REX/Shutterstock (9766568k) Senator Bob Corker, Foreign Relations Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568i) Tammy Baldwin, Secretary of the Conference, Democrat US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568j) Richard Burr, Chairman Select Committee on Intelligence US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568h) Amy Klobuchar, Chair of Steering Committee, Democrat US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568g) Mitch McConnell, Republican Leader US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568f) Senator Susan M. Collins, Committee on Aging Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568d) Senator Pat Roberts, Chairman Agriculture, Nutrition and Forestry US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568e) Mitch McConnell, Republican Leader US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568c) Patty Murray, Assistant Democratic Leader US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568b) Michael B. Enzi, Budget Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568ai) Dan Coats, Director, National Intelligence Agency US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568ag) Senator Ron Johnson, Homeland Security and Governmental Affairs Chairman US Politicians - 20...

Mandatory Credit: Photo by REX/Shutterstock (9766568ah) Senator John Barasso, Republican Policy Committee Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568af) Senator Lamar Alexander, Health, Education, Labor and Pensions Chairman US Politicians - 201...

Mandatory Credit: Photo by REX/Shutterstock (9766568ae) John McCain, Armed Services Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568ad) Lisa Murkowski, Energy and Natural Resources Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568ac) Senator Mike Lee, Joint Economic Committee Vice Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568aa) John Thune, Republican Conference Chairman US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568ab) Senator Chuck Grassley US Politicians - 2018

Mandatory Credit: Photo by REX/Shutterstock (9766568a) Orrin G. Hatch, President Pro Tempore US Politicians - 2018

Mark Zuckerberg, chief executive of Facebook, testifies before a joint Senate Judiciary and Commerce Committee hearing, on Capitol Hill in Washington,...

Mark Zuckerberg, chief executive of Facebook, testifies before a joint Senate Judiciary and Commerce Committee hearing, on Capitol Hill in Washington,...

Mark Zuckerberg, chief executive of Facebook, testifies before a joint Senate Judiciary and Commerce Committee hearing, on Capitol Hill in Washington,...

Mark Zuckerberg, chief executive of Facebook, testifies before a joint Senate Judiciary and Commerce Committee hearing, on Capitol Hill in Washington,...

Mark Zuckerberg, chief executive of Facebook, testifies before a joint Senate Judiciary and Commerce Committee hearing, on Capitol Hill in Washington,...

Mark Zuckerberg, chief executive of Facebook, testifies before a joint Senate Judiciary and Commerce Committee hearing, on Capitol Hill in Washington,...