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Welcome to Scientific American Science Talk posted on October 2nd, 2017. I'm Steve Merski.

The Nobel Assembly at Karolinsky Institute has today decided to award the 2017 Nobel Prize in Physiology or Medicine, jointly to Jeffrey C. Hall, Michael Rosbach, and Michael W. Young, for their discoveries

of molecular mechanisms controlling the circadian rhythm.

Thomas Perlman, Secretary of the Nobel Assembly shortly after 5.30 this morning, Eastern

time.

Jeffrey Hall was born in New York and performed his seminal work at Brandeis University.

He's now retired and lives in Cambridge in Boston.

Michael Rosbach was born in Oklahoma City and He's now retired and lives in Cambridge in Boston.

Michael Rosbach was born in Oklahoma City and performed his prize-winning studies also at Brandeis

University where he's still on the faculty.

And finally Michael Young was born in Miami and did his work at Rockefeller University in New York, where he also remains on the faculty.

So this year's prize concerns the circadian rhythm.

The word circadian originates from the Latin word circa, meaning around, and Dias, meaning day. But in a way, it is actually about astronomy.

Ever since the emergence of life on Earth, about 4 billion years ago,

evolving life forms had to adapt to the rotation of our planet.

This ability to prepare for the regular daily fluctuations

...