stones  used    for grinding,   the sharp   bits    that    were    broken  pots.   Strayer
would   point   to  a   thousand-year-old   corn    cob or  examine some    pottery
and declare it  from    a   certain period  based   on  the clay    and firing
technique.  During  an  alfresco    lunch,  he  described   how one clan    held    a
monopoly    on  a   recipe  for oxidizing   clay    to  make    it  red,    guarding    the
secret  and prospering  in  trade.
“Technology is  always  a   double-edged    sword,” said    Strayer,
fingering   a   delicately  corrugated  sherd   before  passing it  around. “It
enabled progress    but it  changed who they    were.   The cowboys who dug
up  bones   here    suddenly    starting    finding small   skulls  with    flat    heads.
When    the people  here    started cultivating corn,   the mothers had to  tend
the fields, and they    swaddled    the babies’ heads   flat    against a   carryall.
The evolution   of  technology  is  who we  are,    the stepping    stone,  with
inventions  embodying   new ways    of  thinking    and being   from    which   we
can’t   go  back.”  He  seamlessly  segued  to  his own burdens with
technology. “I’m    sure    when    I   get back    I’ll    have    three   or  four    hundred
emails. Most    of  them    will    no  longer  mean    anything.”
If  Strayer wanted  to  wow them,   he  was succeeding. Most    of  the
students    seemed  impressed,  even    amazed, by  these   remote  finds   and
dramatic    rock    fissures.   “I  didn’t  know    I   was going   to  be  deeply
affected    by  this,”  said    Lauren  in  pink    sunglasses, her black   hair    in  a
messy   bun,    “like   when    I   saw that    handprint,  I   almost  cried.  It’s    so
unlike  me.”
Heading out on  morning three,  we  were    met on  the trail   by  a   great
horned  owl that    sat still   as  a   statue  on  a   stone   ledge   over    our heads.
Amelia, a   blonde  with    a   sorority    vibe,   squealed,   “I’ve   never   seen    one
before!”    Earlier,    she had admitted    to  her tentmates   that    she was
missing her phone   because she was waiting for a   cute    boy to  text    her.
But now,    she was transported.    “You    guys!   I   feel    like    I   haven’t lived
until   this    trip!”
We  lunched in  clumps  among   the blooming    prickly pear    where
Butler  Wash    meets   the wide,   gently  flowing San Juan    River.  At  our
