In the entertainment world, people usually like, and find memorable, novels, short stories, and movies with surprise endings. This suggests that classroom teachers might want to present to their students examples of surprising facts associated with principles of physics. Possible benefits of finding surprising facts about principles of physics are opportunities to expand beyond traditional presentations—and, in some cases, to achieve a deeper and broader understanding of those principles. I believe, moreover, that some of the facts presented here may inspire physics teachers to produce some challenge problems for students.

1.
A. James
Mallmann
,
Jeffrey L.
Hock
, and
Kent M.
Ogden
, “
Surprising facts about gravitational forces
,”
Phys. Teach.
32
,
492
495
(
Nov.
1994
).
2.
G. B.
Friedman
and
H. S.
Sandhu
, “
Longitudinal spherical aberration of a thin lens
,”
Am. J. Phys.
35
,
628
(
July
1967
).
3.
A. James
Mallmann
, “
Tree leaf shadows to the Sun's density: A surprising route
,”
Phys. Teach.
51
,
461
462
(
Jan.
2013
).
4.
George W.
Ficken
 Jr.
, “
Physics at home and in the back yard
,”
Phys. Teach.
14
,
282
286
(
May
1976
).
5.
E. Scott
Barr
, “
Image from a pinhole
,”
Phys. Teach.
19
,
154
(
March
1981
).
6.
Thomas B.
Greenslade
 Jr.
, “
Pinhole images of the eclipsing Sun
,”
Phys. Teach.
32
,
347
(
Sept.
1994
).
7.
Victor
Kriss
, “
Measuring pinhole images of the Sun
,”
Phys. Teach.
34
,
190
191
(
March
1996
).
8.
Paul
Hewitt
, “
Figuring Physics: Pinhole image of the Sun
,”
Phys. Teach.
38
,
272
(
May
2000
).
9.
Robert
Greenler
,
Rainbows, Halos, and Glories
(
Cambridge University Press
,
1980
).
10.
David K.
Lynch
and
William
Livingston
,
Color and Light in Nature
(
Cambridge University Press
,
1995
).
11.
M.
Minnaert
,
The Nature of Light and Colour in the Open Air
(
Dover Publications, Inc.
,
1954
).
12.
A. James
Mallmann
, and
Steven P.
Mayer
, “
Some elementary but surprising facts about the Sun's path at sunset
,”
Appl. Opt.
54
,
204
206
(
Feb.
2015
).
13.
J.
Meeus
,
Astronomical Algorithms
(
Willmann-Bell
,
1998
), p.
100
.
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