Brian Greene

  • Aired:  02/18/14
  •  | Views: 32,041

World Science U founder Brian Greene discusses using the Internet to teach physics and gives an overview of Einstein's theory of relativity. (5:53)

( CHEERS AND APPLAUSE ).

>> Stephen: WELCOME BACK,EVERYBODY.

MY GUEST TONIGHT STUDIES THETHEORY OF RELATIVITY.

I'VE ONLY READ E EQUALS MC.

DON'T TELL ME HOW IT ENDS.

PLEASE WELCOME BRIAN GREENE!

HEY, BRIEN, GOOD TO SEE YOU.

THANKS FOR COMING BACK.

>> MY PLEASURE.

>> Stephen: GOOD TO SEE YOUAGAIN.

FOR THE PEOPLE OUT THERE WHO MAYNOT BE, YOU ARE A THEORETICAL

PHYSICIST AT COLUMBIAUNIVERSITY, THE COFOUNDER OF THE

WORLD SCIENCE FESTIVAL.

YOUR NEW PROJECT IS WORLDSCIENCE YOU.

WHICH AIMS TO BECOME THEINTERNET'S BEST SOURCE OF

COURSES FOCUSED EXCLUSIVELYON SCIENCE. WHY

DO YOU WANT TO TEACH SCIENCEON THE INTERNET?

YOU DIDN'T HAVE THE INTERNETWHEN YOU LEARNED SCIENCE?

DOESN'T THAT KIND OF-- DOESN'TTHAT KIND OF CHEAPEN SCIENCE TO

MAKE IT FREE ON THE INTERNET?

>> THAT'S EXACTLY WHAT MOTIVATEDUS TO DO THIS BECAUSE NOW WE CAN

TEACH SCIENCE SO MUCH BETTERTHAN WE COULD BACK THEN.

I STRUGGLED AS A KID TRYING TOLEARN EINSTEIN'S IDEALS OF

RELATIVITY.

>> Stephen: HEY, DUMMY, HEY,DUMMY.

>> EXACTLY RIGHT.

HERE'S THE THING-- IF YOU CANSHOW THE VISUALIZATION OF THE

SLOWING OF TIME OR COMPRESSIONOF SPACE, KIDS GET IT SO MUCH

MORE EASILY THAN IF YOU JUST HADA BLACKBOARD WAY PIECE OF CHALK.

>> Stephen: OKAY, SO YOU HAVETWO LECTURES START STARTING OFF,

IT LAUNCHES NEXT WEEK.

WORLDSCIENCEYOU.COM.

AND THE FIRST TWO LECTURES AREON THE GENERAL AND SPECIFIC--

>> BOTH ON SPECIAL RELATIVITY.

ONE VERSION IS WITHOUT MATH,JUST CONCEPTUALS.

AND ONE HAS THE EQUATIONS FORTHE PEOPLE WHO WANT TO DIG IN

DEEP AND REALLY UNDERSTAND WHATIT'S ALL ABOUT.

>> Stephen: OKAY, GIVE ME THESPECIAL RELATIVITY.

GIVE ME THAT.

IS THAT A BETTER RELATIVITY THANGENERAL?

IS IT LIKE THE ADMIRAL-- YOUKNOW.

GENERAL IS LIKE COACHRELATIVITY?

>> NOW, HERE'S THE DIFFERENCE,HERE'S THE DIFFERENCE.

GENERAL, EINSTEIN TOOK GRAVITYINTO ACCOUNT AND SPECIAL

RELATIVITY, HE DIDN'T.

BUT IN SPECIAL RELATIVITY, HEFIGURED OUT SPACE AND TIME ARE

NOT WHAT WE THINK THEY ARE,RIGHT?

WE ALL HAVE THIS IN OUR MINDTHAT TIME JUST TICKS FORWARD

SECOND AFTER SECOND AFTERSECOND, LIKE THAT RIGHT THERE.

BUT THAT FOOLS US INTO THINKINGTIME WAS THE SAME FOR EVERYONE.

IF YOU WERE TO GET UP FROM THETABLE, RUN AROUND THE ROOM AND

COME BACK, YOUR WATCH WOULD TICKOFF LESS TIME THAN IT WOULD HAVE

IF YOU WERE JUST SITTING STILL.

>> Stephen: WHY?

>> YOU HAVE TO TAKE THE COURSE,BUT HERE'S THE THING--

( CHEERS AND APPLAUSE ).

>> Stephen: SO THE FASTER IGO, THE FASTER I GO, THE LESS I

AGE.

>> IF YOU GO 99.9999999999% OFTHE SPEED OF LIGHT, YOU GO OUT

INTO SPACE FOR SIX MONTHS-- STAYWITH ME-- TURN AROUND AND COME

BACK, YOU WILL HAVE AGED ONLYONE YEAR BUT EARTH WILL HAVE

AGED 223,607 YEARS.

YOU WILL HAVE GONE A QUARTER OFA MILLION YEARS INTO THE FUTURE.

WHEN YOU TELL THAT TO A KID,SCIENCE BECOMES SOMETHING

THEY ARE NO LONGER INTIMIDATEDBY, SOMETHING THAT IS NO LONGER

BORINGTHEY WANT TO LEARN ABOUT IT.

>> Stephen: LET ME GET THISSTRAIGHT, THE CLOSER YOU GET TO

THE SPEED OF LIGHT, THE LESSTIME PASSES FOR YOU, AND THERE'S

A RELATIVE-- RELATIVE TO THEREST OF YOUR-- REST OF THE

WORLD.

>> THE UNIVERSE, EXACTLY RIGHT.

>> Stephen: IT'S GOING FASTERFOR THEM.

IF I HAVE A FLASHLIGHT AND FIRETHE FLASHLIGHT AT YOU THE FIRST

PHOTON IS COMING AT YOU AT THESPEED OF LIGHT, RIGHT?

>> IT IS, SO IS THE SECOND ONE.

>> Stephen: THE FIRST ONE--THERE MIGHT BE A TRAFFIC JAM ON

OR SOMETHING LIKE THAT.

CHRIS CHRISTIE MIGHT PUT UPSOME CONES.

BUT THAT PHOTON IS GOING AT THESPEED OF LIGHT, SO TIME IS NOT

PASSING FOR THE PHOTON THEN-->> YOU COULD SAY THAT.

>> Stephen: BY THE TIME THEPHOTON GETS TO YOU, AM I DEAD?

>> I HOPE NOT.

BUT HERE'S THE THING.

IF YOU CONSIDER AN OBJECT GOINGNEAR THE SPEED OF LIGHT, AT THE

SPEED OF LIGHT POETICALLY, TIMESSTOP, BUT NO MATERIAL OBJECT CAN

EVER GO AT THE SPEED OF LIGHT,SO WE WILL NEVER EXPERIENCE

THAT.

PHOTON HAS NO MASS.

>> Stephen: HOW DOES ITTHEN-- HOW DOES THAT THING IN

THE GLASS, THAT LITTLE THINGTHAT TWIRLZ AROUND, THE LIGHT

LIGHT BULB WITH THE BLACKWHITE, FLAG THAT TWIRLZ

AROUND INSIDE.

YOU HAVE EVER SEEN IT?

THERE'S A LIGHT BULB WITH ANEEDLE INSIDE AND IT HAS FLAGS

AND YOU PUT IT IN THE SUNSHINEAND IT SPINS AROUND BECAUSE THE

WEIGHT OF THE-->> OH, I KNOW THE THING THE

RADIOMETER.

LIKE LIGHT CAN PUSH.

>> Stephen: IT HAS MASS.

>> IT HAS ENERGY.

>> Stephen: ENERGY EQUALSMASS TIMES THE SPEED OF LIGHT

SQUARED BY ( BLEEP ).

( CHEERS AND APPLAUSE )>> IT HAS NO MASS IF IT WERE AT

REST.

THAT'S THE KEY THING.

>> Stephen: BUT IT'S NOT ATREST.

>> THAT'S WHY IT CAN ENERGY.

>> Stephen: CAN IT HAVEINFINITE MASS BECAUSE IT'S

GOING INFINITELY FAST.

>> IT HAS A FINITE AMOUNT OFENERGY. WE KNOW THAT BECAUSE YOU

CAN PUSH ON IT AND FEEL IT.

THE SUN'S HEAT GIVES ENERGY TOTHE EARTH AND ALLOWS THE PLANT

TO GROW.

>> Stephen: I KNOW THE SUN ISHOT.

OKAY, SO IT STARTS NEXT WEEK.

>> YES.

>> Stephen: OKAY, AND HOW DOPEOPLE GET TO IT

WORLDSCIENCEU.COM.

PEOPLE SHOULD GO AND SIGN UP ANDIT WILL BE A FUN RIDE.

>> Stephen: DOES THIS COSTANYTHING?

>> NO, IT'S FREE.

>> Stephen: THEN HOW DOES THEUNIVERSITY MAKE ITS MONEY, OFF

OF THE FOOTBALL TEAM?

>> THAT'S A GOOD QUESTION.

I DON'T KNOW.

I DON'T THINK ABOUT THOSETHINGS.

I JUST WANT TO GET GOOD MATERIALOUT TO THE WORLD.

>> Stephen: YOU'RE ATHEORETICAL PHYSICIST AND A

THEORETICAL BUSINESS MAN.

>> THERE YOU ARE!

>> Stephen: BRIAN GREENE,WORLDSCIENCEU.COM.

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