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Volume 71, Issue 5
An unexpected consequence of a roller coaster ride
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Lesson of the month
An unexpected consequence of a roller coaster ride
Free
Online download statistics by month:
Online download statistics by month: October 2001 to December 2022
Abstract
Full
Pdf
Oct 2001
0
189
31
Nov 2001
0
120
13
Dec 2001
0
27
3
Jan 2002
0
21
5
Feb 2002
0
21
4
Mar 2002
0
19
3
Apr 2002
0
19
3
May 2002
0
18
2
Jun 2002
0
13
4
Jul 2002
0
23
4
Aug 2002
0
9
0
Sep 2002
0
10
1
Oct 2002
0
9
1
Nov 2002
0
21
11
Dec 2002
0
17
4
Jan 2003
0
13
7
Feb 2003
0
14
7
Mar 2003
0
9
9
Apr 2003
0
6
3
May 2003
0
13
12
Jun 2003
0
10
7
Jul 2003
0
15
3
Aug 2003
0
5
0
Sep 2003
0
16
6
Oct 2003
0
10
2
Nov 2003
0
13
5
Dec 2003
1
9
4
Feb 2004
0
2
0
Mar 2004
0
4
1
Apr 2004
0
10
7
May 2004
0
9
4
Jun 2004
1
12
11
Jul 2004
0
60
4
Aug 2004
0
67
11
Sep 2004
0
53
6
Oct 2004
7
25
9
Nov 2004
17
17
6
Dec 2004
4
26
5
Jan 2005
11
32
6
Feb 2005
16
37
17
Mar 2005
8
33
10
Apr 2005
6
42
3
May 2005
7
23
9
Jun 2005
7
47
13
Jul 2005
4
27
5
Aug 2005
9
25
6
Sep 2005
16
49
9
Oct 2005
2
30
13
Nov 2005
8
64
14
Dec 2005
7
22
8
Jan 2006
2
25
7
Feb 2006
3
23
3
Mar 2006
5
43
8
Apr 2006
5
22
6
May 2006
4
26
4
Jun 2006
5
29
5
Jul 2006
5
38
14
Aug 2006
4
37
9
Sep 2006
4
21
15
Oct 2006
8
33
39
Nov 2006
4
16
9
Dec 2006
5
14
17
Jan 2007
3
14
14
Feb 2007
2
36
18
Mar 2007
9
33
30
Apr 2007
30
3
4
May 2007
64
3
4
Jun 2007
62
7
7
Jul 2007
49
24
27
Aug 2007
90
24
16
Sep 2007
37
20
8
Oct 2007
47
9
12
Nov 2007
18
6
4
Dec 2007
15
2
3
Jan 2008
18
5
3
Feb 2008
18
5
5
Mar 2008
30
6
3
Apr 2008
43
4
4
May 2008
31
1
1
Jun 2008
36
2
1
Jul 2008
53
5
1
Aug 2008
64
7
3
Sep 2008
36
6
1
Oct 2008
12
6
2
Nov 2008
23
4
3
Dec 2008
8
5
3
Jan 2009
7
3
3
Feb 2009
7
0
0
Mar 2009
16
1
2
Apr 2009
9
1
1
May 2009
25
0
1
Jun 2009
22
8
1
Jul 2009
42
1
0
Aug 2009
34
5
1
Sep 2009
23
2
0
Oct 2009
22
2
2
Nov 2009
13
3
2
Dec 2009
21
0
1
Jan 2010
12
1
1
Feb 2010
13
5
7
Mar 2010
18
2
3
Apr 2010
29
2
1
May 2010
32
1
5
Jun 2010
22
2
1
Jul 2010
28
16
4
Aug 2010
22
6
2
Sep 2010
35
7
0
Oct 2010
29
11
4
Nov 2010
30
14
3
Dec 2010
17
5
1
Jan 2011
35
11
0
Feb 2011
20
13
1
Mar 2011
57
19
0
Apr 2011
29
8
0
May 2011
25
4
1
Jun 2011
62
5
1
Jul 2011
55
5
2
Aug 2011
53
7
1
Sep 2011
82
5
1
Oct 2011
35
4
2
Nov 2011
47
22
1
Dec 2011
18
30
4
Jan 2012
16
30
2
Feb 2012
15
20
1
Mar 2012
18
42
4
Apr 2012
17
59
5
May 2012
21
81
7
Jun 2012
25
77
19
Jul 2012
19
131
18
Aug 2012
20
112
23
Sep 2012
27
99
10
Oct 2012
20
134
11
Nov 2012
0
74
9
Dec 2012
0
33
13
Jan 2013
0
33
6
Feb 2013
0
30
7
Mar 2013
0
54
2
Apr 2013
0
74
7
May 2013
0
88
5
Jun 2013
13
124
5
Jul 2013
6
216
1
Aug 2013
3
233
1
Sep 2013
13
127
9
Oct 2013
19
189
5
Nov 2013
9
114
2
Dec 2013
14
88
7
Jan 2014
13
79
6
Feb 2014
8
80
4
Mar 2014
17
109
3
Apr 2014
15
178
1
May 2014
10
308
4
Jun 2014
11
401
2
Jul 2014
14
500
5
Aug 2014
6
559
2
Sep 2014
8
338
2
Oct 2014
8
342
4
Nov 2014
3
151
3
Dec 2014
7
338
11
Jan 2015
7
141
5
Feb 2015
4
84
2
Mar 2015
5
139
4
Apr 2015
5
210
1
May 2015
10
273
3
Jun 2015
10
303
2
Jul 2015
6
270
2
Aug 2015
7
229
7
Sep 2015
11
116
2
Oct 2015
6
52
0
Nov 2015
6
73
1
Dec 2015
8
38
9
Jan 2016
9
25
9
Feb 2016
10
29
6
Mar 2016
12
37
5
Apr 2016
2
45
6
May 2016
8
41
5
Jun 2016
11
39
16
Jul 2016
11
39
8
Aug 2016
15
54
3
Sep 2016
13
56
10
Oct 2016
10
146
4
Nov 2016
11
100
0
Dec 2016
13
27
1
Jan 2017
11
24
3
Feb 2017
6
20
1
Mar 2017
7
26
3
Apr 2017
9
92
5
May 2017
6
57
1
Jun 2017
36
85
3
Jul 2017
114
110
0
Aug 2017
199
190
1
Sep 2017
172
154
2
Oct 2017
149
133
3
Nov 2017
109
94
2
Dec 2017
84
80
2
Jan 2018
77
61
2
Feb 2018
93
83
0
Mar 2018
120
107
2
Apr 2018
243
221
9
May 2018
305
279
4
Jun 2018
377
369
1
Jul 2018
513
503
6
Aug 2018
1021
1013
9
Sep 2018
643
633
9
Oct 2018
622
612
28
Nov 2018
330
322
8
Dec 2018
310
308
4
Jan 2019
269
261
2
Feb 2019
265
256
6
Mar 2019
454
446
15
Apr 2019
554
548
10
May 2019
654
652
5
Jun 2019
839
829
4
Jul 2019
973
973
7
Aug 2019
1003
997
7
Sep 2019
667
667
7
Oct 2019
751
741
7
Nov 2019
439
418
5
Dec 2019
387
383
2
Jan 2020
311
304
11
Feb 2020
287
283
7
Mar 2020
208
199
9
Apr 2020
59
59
6
May 2020
64
62
6
Jun 2020
95
93
3
Jul 2020
238
234
10
Aug 2020
258
256
3
Sep 2020
274
257
3
Oct 2020
261
260
8
Nov 2020
172
170
4
Dec 2020
205
200
4
Jan 2021
183
177
11
Feb 2021
141
139
11
Mar 2021
207
199
6
Apr 2021
313
314
7
May 2021
419
427
6
Jun 2021
682
692
10
Jul 2021
948
964
10
Aug 2021
923
923
11
Sep 2021
520
521
9
Oct 2021
363
354
19
Nov 2021
97
96
15
Dec 2021
152
151
9
Jan 2022
150
156
7
Feb 2022
155
162
1
Mar 2022
283
289
11
Apr 2022
344
345
17
May 2022
371
370
17
Jun 2022
435
438
19
Jul 2022
780
784
14
Aug 2022
724
729
12
Sep 2022
651
654
18
Oct 2022
682
688
11
Nov 2022
293
295
10
Dec 2022
222
228
5
Total
27915
35610
1566
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