  We investigate the light variations of 15 Am stars using four years of
high-precision photometry from the Kepler spacecraft and an additional 14 Am
stars from the K2 Campaign 0 field. We find that most of the Am stars in the
Kepler field have light curves characteristic of rotational modulation due to
star spots. Of the 29 Am stars observed, 12 are {\delta} Scuti variables and
one is a {\gamma} Doradus star. One star is an eclipsing binary and another was
found to be a binary from time-delay measurements. Two Am stars show evidence
for flares which are unlikely to be due to a cool companion. The fact that 10
out of 29 Am stars are rotational variables and that some may even flare
strongly suggests that Am stars possess significant magnetic fields. This is
contrary to the current understanding that the enhanced metallicity in these
stars is due to diffusion in the absence of a magnetic field. The fact that so
many stars are {\delta} Scuti variables is also at odds with the prediction of
diffusion theory. We suggest that a viable alternative is that the metal
enhancement could arise from accretion.
