“Einstein made the bold claim that a clock placed at sea level ticks more slowly than one placed at the top of a mountain”
URCEG CPF VKOG .GVoU VJKPM CDQWV VJG LQWTPG[ HTQO VJG RGTURGEVKXG QH VJQUG QPDQCTF (QT VJGO # PFTQOGFC KU JWTVNKPI ENQUGT CV PGCTN[ VJG URGGF QH NKIJV + H VJG URCEGUJKR JCF VQ VTCXGN OKNNKQP NKIJV [GCTU VJGP KV YQWNF VCMG
OKNNKQP [GCTU VQ IGV VJGTG $WV CU YGoXG LWUV UGGP KV YKNN CTTKXG KP [GCTU 6JKU KORNKGU VJCV HTQO VJG URCEGHCTGTUo RQKPV QH XKGY VJG FKUVCPEG VQ # PFTQOGFC KU LWUV NKIJV [GCTU
+ P QVJGT YQTFU 'KPUVGKPoU VJGQT[ HQTEGU WU VQ EQPENWFG VJCV NKMG VKOG
distances KP URCEG CTG CNUQ UWDLGEVKXG VJKPIU +V UKORN[ FQGU PQV OCMG UGPUG VQ UC[ VJCV pVJG FKUVCPEG VQ # PFTQOGFC KU OKNNKQP NKIJV [GCTU q 9G JCXG VQ CFF VJG ECXGCV pCU FGVGTOKPGF D[ RGQRNG QP 'CTVJ q
WHAT GOES UP…
'KPUVGKP YTQVG FQYP JKU 5RGEKCN 6JGQT[ QH 4GNCVKXKV[ KP JKU annus
mirabilis $WV VJGTG YCU OQTG VQ EQOG +P JG ECOG WR YKVJ C PGY VJGQT[ QH ITCXKV[ YJKEJ UWRGTUGFGF VJG QPG YTKVVGP FQYP OQTG VJCP [GCTU GCTNKGT D[ +UCCE 0GYVQP 9KVJ JKU ) GPGTCN 6JGQT[ QH 4GNCVKXKV[ 'KPUVGKP OCFG VJG DQNF ENCKO VJCV C ENQEM RNCEGF CV UGC NGXGN VKEMU OQTG UNQYN[ VJCP QPG RNCEGF CV VJG VQR QH C OQWPVCKP + P QVJGT YQTFU VKOG RCUUGU CV FKHHGTGPV TCVGU FGRGPFKPI QP VJG UVTGPIVJ QH ITCXKV[ YJKEJ FGETGCUGU CU [QW IGV HWTVJGT HTQO 'CTVJoU EQTG
9G ECP CRRTGEKCVG YJ[ VJKU OKIJV DG VTWG D[ ECNNKPI QPEG CICKP WRQP VJG YKUFQO QH )CNKNGQ #U NGIGPF JCU KV JG FTQRRGF C JGCX[ DCNN CPF C NKIJV DCNN HTQO VJG .GCPKPI 6QYGT QH 2KUC CPF EQPHKTOGF VJCV VJG VYQ JKV VJG ITQWPF CV VJG UCOG VKOG *G JCF UJQYP VJCV CNN QDLGEVU CEEGNGTCVG VQ VJG ITQWPF CV VJG UCOG TCVG 6JKU HGCVWTG QH ITCXKV[ KU KPVTKIWKPI DGECWUG KV OGCPU VJGTGoU PQ FKHHGTGPEG DGVYGGP FQKPI CP GZRGTKOGPV QP VJG 'CTVJ CPF FQKPI KV KPUKFG C URCEGUJKR CEEGNGTCVKPI CV I YJKEJ KU GSWCN VQ VJG ITCXKVCVKQPCN RWNN CV VJG 'CTVJoU UWTHCEG + P QVJGT YQTFU VJG GHHGEVU QH ITCXKV[ CPF CEEGNGTCVKQP CTG GUUGPVKCNN[ VJG UCOG
5Q JQY FQGU VJKU NKPM KP YKVJ 'KPUVGKPoU KFGCU CDQWV ITCXKV[! .GVoU TGVWTP CICKP VQ VJG VYKP RCTCFQZ 9JGP VJG CUVTQPCWV VYKP HKTGU WR JGT TQEMGVU CPF CEEGNGTCVGU JGT URCEGUJKR