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FAR, FAR AWAY  With the help of a new instrument, researchers measured distances to 181 galaxies, seen in this Hubble Space Telescope image, including a few that Hubble missed (highlighted).

GAME ON  Researchers have discovered brain cells in video game-playing macaques that predict another monkey’s next move. Such brain cells may be important in social interactions that require anticipating what others are thinking.

green hermit hummingbird

DESIRABLE DINER  A green hermit hummingbird has a long bill that can sip more nectar than other birds from the tropical plant Heliconia tortuosa, triggering the plant to start reproducing.

VACUUM ATTRACTION  Fleeting electromagnetic waves nudge parallel plates together through a phenomenon called the Casimir effect, illustrated here. If the same thing works with gravitational waves, it could prove the existence of particles that transmit gravity.



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