,HUMANITY'S MEASURING INSTRUMENTS KEEP
SETTING RECORDS THAT SOUND IMPOSSIBLE4
,THIS IS THE CURRENT LEAGUE TABLE  THE
GENUINELY SMALLEST QUANTITIES EVER
DETECTED1 HOW THEY WERE CAUGHT1 AND WHY
EACH ONE MATTERED4 ,FOR THE NEWEST
MEMBER OF THE CLUB1 SEE ZEPTOVERSE4
#A4 ,THE SMALLEST DISTANCE EVER PROBED 
THE ZEPTOVERSE "<@9#AJ_< ;M">
,ON #C ,NOVEMBER #BJBF1 ,,CERN'S ,L,H,CB
EXPERIMENT ANNOUNCED EVIDENCE OF THE
RAREST PARTICLE DECAY EVER OBSERVED  A
,BP MESON DECAYING TO TWO MUONS1 ONCE IN
@9#AJ BILLION TRIES  AND WITH IT THE
SMALLEST DISTANCE SCALE EVER EXPLORED3
INTERACTIONS AT ROUGHLY A HUNDRED
BILLIONTH THE SIZE OF AN ATOM4 ,NO
INSTRUMENT RESOLVES A ZEPTOMETRE
DIRECTLY2 THE MEASUREMENT IS MADE
THROUGH QUANTUM VIRTUAL PARTICLES WHOSE
INFLUENCE REACHES THAT FAR4 ,SEE ONE IN
TEN BILLION DECAY4
#B4 ,THE SMALLEST DISPLACEMENT EVER
MEASURED  ,,LIGO "<@9#AJ_<;X ;M">
,IN ,SEPTEMBER #BJAE1 ,,LIGO'S TWO
GRAVITATIONAL-WAVE DETECTORS REGISTERED
A STRAIN OF @9#AJ_<  THEIR #D-KILOMETRE
ARMS STRETCHING AND SQUEEZING BY ABOUT
#AJ_<;X METRES1 ROUGHLY A THOUSANDTH OF
THE WIDTH OF A PROTON4 ,IT IS THE
SMALLEST DISPLACEMENT EVER DIRECTLY
MEASURED1 MADE POSSIBLE BY LASER
INTERFEROMETRY1 SUSPENDED MIRRORS1 AND
SEISMIC ISOLATION4 ,THE SIGNAL  TWO
COLLIDING BLACK HOLES  WON THE #BJAG
,NOBEL ,PRIZE4
#C4 ,THE SMALLEST TIME EVER MEASURED 
#BDG ZEPTOSECONDS
,IN #BJBJ1 ,FRANKFURT PHYSICISTS TIMED A
PHOTON CROSSING A HYDROGEN MOLECULE3
#BDG ZEPTOSECONDS  #BDG  #AJ_< SECONDS 
THE FASTEST PROCESS EVER CLOCKED4 ,IN
THAT INTERVAL1 LIGHT ITSELF TRAVELS
ABOUT A THIRD OF A NANOMETRE4
#D4 ,THE SMALLEST MASS  THE NEUTRINO
"<@<#J4DE E,V">
,THE NEUTRINO IS THE LIGHTEST PARTICLE
KNOWN TO HAVE MASS  AND NOBODY HAS
FINISHED WEIGHING IT4 ,THE ,,KATRIN
EXPERIMENT'S BEST MEASUREMENT PUTS THE
CEILING NEAR A FEW TENTHS OF AN
ELECTRONVOLT  OVER A MILLION TIMES
LIGHTER THAN THE ELECTRON4 ,THE SIGNAL
HUNTED IS A DEFICIT OF A FEW
ELECTRON-VOLTS AT THE EXTREME TAIL OF
TRITIUM BETA DECAY  AN ACT OF WEIGHING
THE NEARLY-WEIGHTLESS4
#E4 ,THE SMALLEST DETECTABLE ENERGY  A
SINGLE PHOTON
,LIGHT COMES IN INDIVISIBLE PACKETS1 AND
THE BOTTOM OF THE SCALE IS ONE PHOTON3
SINGLE-PHOTON DETECTORS
"<SUPERCONDUCTING NANOWIRE DETECTORS1
PHOTOMULTIPLIERS"> ROUTINELY COUNT
INDIVIDUAL QUANTA  EACH CARRYING A FEW
ELECTRON-VOLTS OF ENERGY1 THE SMALLEST
TRANSACTION NATURE PERMITS IN
ELECTROMAGNETISM4 ,QUANTUM COMPUTERS1
ASTRONOMY'S FAINTEST-SOURCE
MEASUREMENTS1 AND QUANTUM-KEY SYSTEMS
ALL RUN ON COUNTING SINGLE PHOTONS4
#F4 ,THE SMALLEST VERIFIED DISCREPANCY 
THE ELECTRON'S MAGNETIC MOMENT
,PERHAPS THE MOST ASTONISHING 8SMALL0
MEASUREMENT OF ALL ISN'T A DISTANCE OR
TIME BUT A MATCH3 THE ELECTRON'S
ANOMALOUS MAGNETIC MOMENT HAS BEEN
MEASURED TO ABOUT ONE PART IN #AJ  AND
PREDICTED BY QUANTUM ELECTRODYNAMICS TO
MATCHING PRECISION4 ,MEASURING SOMETHING
CORRECTLY TO A PART PER TRILLION IS1
UNIT FOR UNIT1 THE MOST PRECISE VERIFIED
AGREEMENT IN SCIENCE  HUMANITY'S DEEPEST
CONFIRMATION THAT QUANTUM THEORY
DESCRIBES REALITY4
,THE FLOOR  THE ,PLANCK LENGTH "<#AJ_<;U
;M">
,ONE SCALE SITS BELOW EVERYTHING
MEASURABLE3 THE ,PLANCK LENGTH1 @9#A4F 
#AJ_<;U METRES  ABOUT A HUNDRED TRILLION
TIMES SMALLER THAN THE ZEPTOVERSE  WHERE
QUANTUM MECHANICS AND GRAVITY COLLIDE
AND 8DISTANCE0 MAY LOSE ITS MEANING4
,NOTHING SHORTER IS MEASURABLE1 EVEN IN
PRINCIPLE1 UNDER CURRENT PHYSICS3
ATTEMPTING TO RESOLVE SMALLER SCALES
REQUIRES CONCENTRATING SO MUCH ENERGY
THAT YOU'D COLLAPSE THE REGION INTO A
BLACK HOLE4 ,THE ,PLANCK LENGTH ISN'T
JUST SMALL  IT MAY BE THE SMALLEST
POSSIBLE SMALL4
,SEE ALSO
"9 ZEPTOVERSE  THE NEWLY OPENED SMALLEST
REALM "9 ONE IN TEN BILLION DECAY  HOW
THE ZEPTOVERSE WAS FOUND "9
GRAVITATIONAL WAVE  ,,LIGO'S STORY "9
ZEPTOSECOND  THE TIME RECORD "9 NEUTRINO
THE GHOST THAT ALMOST WEIGHS NOTHING