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Buy from Amazon $50.61$0.01 $75.00 $25.00 Jul Sep Nov Jan Mar May Jul Sep Nov Jan Mar May 2014 2015 2016 $28.45, May 10 - Jul 29$15.00, May 10 - Jun 18$7.49, May 10 - May 26$28.45, May 10 - Jul 29$15.00, May 10 - Jun 18$9.49, May 28 - Jun 4$28.45, May 10 - Jul 29$15.00, May 10 - Jun 18$12.97, Jun 6 1:43 pm$28.45, May 10 - Jul 29$16.01, Jun 7 - Jun 13$15.00, May 10 - Jun 18$28.45, May 10 - Jul 29$15.00, May 10 - Jun 18$14.99, Jun 14 - Jun 20$28.45, May 10 - Jul 29$26.75, Jun 19 9:18 am$14.99, Jun 14 - Jun 20$28.45, May 10 - Jul 29$28.00, Jun 20 - Jul 17$16.98, Jun 20 - Jun 22$28.45, May 10 - Jul 29$28.00, Jun 20 - Jul 17$16.92, Jun 23 3:54 am$28.45, May 10 - Jul 29$28.00, Jun 20 - Jul 17$17.49, Jun 24 4:29 pm$37.80, Jun 27 - Jul 2$28.45, May 10 - Jul 29$28.00, Jun 20 - Jul 17$28.45, May 10 - Jul 29$28.00, Jun 20 - Jul 17$26.78, Jul 4 - Aug 2$28.45, May 10 - Jul 29$26.78, Jul 4 - Aug 2$26.19, Jul 18 - Jul 30$28.16, Jul 30 - Sep 8$26.78, Jul 4 - Aug 2$26.19, Jul 18 - Jul 30$28.16, Jul 30 - Sep 8$26.78, Jul 4 - Aug 2$25.91, Jul 31 - Sep 8$28.16, Jul 30 - Sep 8$26.77, Aug 2 - Aug 5$25.91, Jul 31 - Sep 8$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$14.99, Aug 6 5:37 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$24.11, Aug 8 6:18 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$24.01, Aug 10 9:16 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$23.95, Aug 12 5:51 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$22.27, Aug 14 4:06 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$22.25, Aug 15 - Aug 16$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$22.24, Aug 17 4:38 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$22.18, Aug 19 11:48 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$20.87, Aug 22 3:12 am$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$19.97, Aug 23 2:15 am$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$19.47, Aug 25 5:52 am$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$18.81, Aug 27 10:14 am$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$18.51, Aug 28 2:48 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$18.07, Aug 30 10:37 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$17.19, Sep 2 7:15 am$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$16.72, Sep 3 11:00 am$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$16.03, Sep 5 9:02 pm$28.16, Jul 30 - Sep 8$25.91, Jul 31 - Sep 8$15.41, Sep 7 2:17 am$27.87, Sep 9 - Sep 23$25.63, Sep 9 - Sep 23$14.88, Sep 9 11:38 am$27.87, Sep 9 - Sep 23$25.63, Sep 9 - Sep 23$14.45, Sep 10 4:19 pm$27.87, Sep 9 - Sep 23$25.63, Sep 9 - Sep 23$13.29, Sep 13 1:06 am$27.87, Sep 9 - Sep 23$25.63, Sep 9 - Sep 23$12.48, Sep 15 2:14 am$27.87, Sep 9 - Sep 23$25.63, Sep 9 - Sep 23$11.39, Sep 19 3:36 am$27.87, Sep 9 - Sep 23$25.63, Sep 9 - Sep 23$10.43, Sep 22 2:10 am$27.87, Sep 9 - Sep 23$25.63, Sep 9 - Sep 23$10.13, Sep 23 7:37 am$28.01, Sep 25 - Sep 29$25.77, Sep 25 - Oct 1$8.71, Sep 25 10:47 am$28.01, Sep 25 - Sep 29$25.77, Sep 25 - Oct 1$8.32, Sep 27 1:16 pm$28.01, Sep 25 - Sep 29$25.77, Sep 25 - Oct 1$7.34, Sep 29 2:50 pm$27.73, Oct 1 - Dec 16$25.77, Sep 25 - Oct 1$5.35, Oct 1 5:52 pm$27.73, Oct 1 - Dec 16$25.49, Oct 3 - Nov 2$3.89, Oct 3 8:08 pm$27.73, Oct 1 - Dec 16$25.49, Oct 3 - Nov 2$2.90, Oct 5 9:28 pm$27.73, Oct 1 - Dec 16$25.49, Oct 3 - Nov 2$1.84, Oct 8 1:52 am$27.73, Oct 1 - Dec 16$25.49, Oct 3 - Nov 2$1.47, Oct 10 7:25 am$27.73, Oct 1 - Dec 16$25.49, Oct 3 - Nov 2$0.93, Oct 12 9:22 am$27.73, Oct 1 - Dec 16$25.49, Oct 3 - Nov 2$0.41, Oct 14 11:40 am$27.73, Oct 1 - Dec 16$25.49, Oct 3 - Nov 2$0.01, Oct 16 - Apr 16$27.73, Oct 1 - Dec 16$24.33, Nov 9 - Dec 6$0.01, Oct 16 - Apr 16$27.73, Oct 1 - Dec 16$23.64, Dec 8 - Dec 14$0.01, Oct 16 - Apr 16$27.73, Oct 1 - Dec 16$23.16, Dec 16 10:00 am$0.01, Oct 16 - Apr 16$28.43, Dec 18 - Dec 24$23.02, Dec 18 8:45 am$0.01, Oct 16 - Apr 16$28.43, Dec 18 - Dec 24$22.30, Dec 22 11:48 am$0.01, Oct 16 - Apr 16$28.43, Dec 18 - Dec 24$28.41, Dec 23 - Dec 24$0.01, Oct 16 - Apr 16$28.28, Dec 25 - Dec 31$28.26, Dec 25 5:21 pm$0.01, Oct 16 - Apr 16$28.28, Dec 25 - Dec 31$24.17, Dec 26 7:34 pm$0.01, Oct 16 - Apr 16$28.28, Dec 25 - Dec 31$22.94, Dec 30 8:32 am$0.01, Oct 16 - Apr 16$28.28, Dec 25 - Dec 31$22.57, Dec 31 9:30 pm$0.01, Oct 16 - Apr 16$28.13, Jan 2 - Jan 7$21.60, Jan 2 3:37 pm$0.01, Oct 16 - Apr 16$28.13, Jan 2 - Jan 7$21.13, Jan 4 5:33 am$0.01, Oct 16 - Apr 16$28.13, Jan 2 - Jan 7$20.11, Jan 6 5:39 am$0.01, Oct 16 - Apr 16$27.98, Jan 8 - Jan 15$19.06, Jan 8 11:26 am$0.01, Oct 16 - Apr 16$27.98, Jan 8 - Jan 15$18.45, Jan 9 10:47 am$0.01, Oct 16 - Apr 16$27.98, Jan 8 - Jan 15$16.93, Jan 11 9:42 pm$0.01, Oct 16 - Apr 16$27.98, Jan 8 - Jan 15$16.25, Jan 13 8:24 am$0.01, Oct 16 - Apr 16$27.98, Jan 8 - Jan 15$15.61, Jan 15 1:09 am$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$14.90, Jan 16 4:41 pm$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$14.09, Jan 18 8:26 am$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$13.35, Jan 21 - Jan 23$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$21.20, Jan 24 9:49 pm$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$20.36, Jan 26 1:46 pm$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$18.78, Jan 28 7:15 am$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$16.48, Jan 30 12:37 am$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$15.94, Jan 31 7:51 pm$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$15.37, Feb 2 3:01 pm$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$13.23, Feb 4 10:30 am$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$12.43, Feb 6 4:35 am$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$11.52, Feb 8 12:00 am$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$10.58, Feb 9 6:53 pm$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$10.03, Feb 11 1:59 pm$0.01, Oct 16 - Apr 16$27.84, Jan 16 - Feb 13$8.92, Feb 13 9:25 am$0.01, Oct 16 - Apr 16$27.79, Feb 15 - Feb 20$7.68, Feb 15 5:33 am$0.01, Oct 16 - Apr 16$27.79, Feb 15 - Feb 20$6.70, Feb 17 5:27 am$0.01, Oct 16 - Apr 16$27.79, Feb 15 - Feb 20$5.71, Feb 19 2:07 am$0.01, Oct 16 - Apr 16$27.79, Feb 15 - Feb 20$4.51, Feb 20 11:42 pm$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$3.45, Feb 22 9:43 pm$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$2.95, Feb 24 7:06 pm$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$4.79, Feb 26 6:10 pm$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$3.47, Feb 28 3:58 pm$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$4.96, Mar 3 6:41 am$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$3.62, Mar 5 6:55 am$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$24.25, Mar 7 6:48 am$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$24.45, Mar 9 6:00 am$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$24.33, Mar 11 1:15 pm$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$24.35, Mar 13 8:30 pm$0.01, Oct 16 - Apr 16$28.45, Feb 22 - Mar 16$22.16, Mar 16 10:37 pm$0.01, Oct 16 - Apr 16$27.63, Mar 19 - Apr 1$20.39, Mar 19 1:37 am$0.01, Oct 16 - Apr 16$27.63, Mar 19 - Apr 1$18.69, Mar 21 5:29 am$0.01, Oct 16 - Apr 16$27.63, Mar 19 - Apr 1$17.71, Mar 23 12:19 pm$0.01, Oct 16 - Apr 16$27.63, Mar 19 - Apr 1$14.83, Mar 25 7:03 pm$0.01, Oct 16 - Apr 16$27.63, Mar 19 - Apr 1$13.88, Mar 28 2:18 am$0.01, Oct 16 - Apr 16$27.63, Mar 19 - Apr 1$11.69, Mar 30 10:45 am$0.01, Oct 16 - Apr 16$27.63, Mar 19 - Apr 1$6.65, Apr 1 6:18 pm$0.01, Oct 16 - Apr 16$27.86, Apr 4 - Apr 16$4.37, Apr 4 9:03 am$0.01, Oct 16 - Apr 16$27.86, Apr 4 - Apr 16$5.04, Apr 7 12:56 am$0.01, Oct 16 - Apr 16$27.86, Apr 4 - Apr 16$5.55, Apr 9 5:55 pm$0.01, Oct 16 - Apr 16$27.86, Apr 4 - Apr 16$5.07, Apr 11 7:29 am$0.01, Oct 16 - Apr 16$27.86, Apr 4 - Apr 16$4.89, Apr 14 1:01 am$0.01, Oct 16 - Apr 16$27.86, Apr 4 - Apr 16$4.13, Apr 16 4:24 pm$0.01, Oct 16 - Apr 16$27.72, May 12 - May 15$9.68, May 12 3:47 am$2.81, May 12 3:47 am$27.72, May 12 - May 15$9.56, May 15 11:51 am$3.49, May 15 - May 19$27.58, May 19 - Jun 18$9.37, May 19 5:24 pm$3.49, May 15 - May 19$27.58, May 19 - Jun 18$9.21, May 23 8:15 pm$3.48, May 23 8:15 pm$27.58, May 19 - Jun 18$8.35, May 28 4:05 am$3.50, May 28 - Jun 6$27.58, May 19 - Jun 18$8.15, Jun 1 6:48 pm$3.50, May 28 - Jun 6$27.58, May 19 - Jun 18$7.91, Jun 6 10:04 am$3.50, May 28 - Jun 6$27.58, May 19 - Jun 18$7.75, Jun 10 3:03 pm$4.19, Jun 10 3:03 pm$27.58, May 19 - Jun 18$7.61, Jun 14 10:57 am$4.99, Jun 14 10:57 am$27.58, May 19 - Jun 18$20.50, Jun 18 - Jun 21$11.98, Jun 18 4:50 am$43.75, Jun 21 11:06 pm$28.45, Jun 21 - Jun 23$20.50, Jun 18 - Jun 21$38.92, Jun 23 9:14 pm$28.45, Jun 21 - Jun 23$24.20, Jun 23 9:14 pm$28.26, Jun 25 - Jun 27$24.19, Jun 25 - Jun 27$24.01, Jun 25 - Jun 27OOS $28.26, Jun 29 9:28 pm$24.18, Jun 29 9:28 pm$24.01, Jun 25 - Jun 27$37.59, Jul 1 9:34 pm$28.32, Jul 1 9:34 pm$24.07, Jul 1 - Jul 6$37.44, Jul 4 1:11 am$28.45, Jul 4 - Jul 6$24.07, Jul 1 - Jul 6$37.29, Jul 6 5:50 am$28.45, Jul 4 - Jul 6$24.07, Jul 1 - Jul 6$37.11, Jul 8 12:08 pm$28.31, Jul 8 12:08 pm$24.07, Jul 1 - Jul 6$36.93, Jul 11 2:01 pm$28.45, Jul 11 2:01 pm$24.07, Jul 1 - Jul 6$36.60, Jul 13 8:50 pmOOS $28.45, Jul 13 8:50 pm$24.07, Jul 1 - Jul 6$34.15, Jul 17 11:43 am$28.45, Jul 17 11:43 am$23.65, Jul 17 11:43 am$27.44, Jul 19 - Jul 22$27.17, Jul 19 7:29 am$24.17, Jul 19 7:29 am$27.44, Jul 19 - Jul 22$24.02, Jul 22 10:23 pm$23.04, Jul 22 - Jul 30$27.30, Jul 26 - Jul 30$23.04, Jul 22 - Jul 30$20.51, Jul 26 11:42 am$27.30, Jul 26 - Jul 30$23.04, Jul 22 - Jul 30$19.98, Jul 30 - Aug 10$25.93, Aug 2 - Aug 6$23.03, Aug 2 - Aug 6$19.98, Jul 30 - Aug 10$25.49, Aug 10 - Sep 28$21.25, Aug 10 3:15 am$19.98, Jul 30 - Aug 10$25.49, Aug 10 - Sep 28$21.24, Aug 13 9:54 pm$15.94, Aug 13 9:54 pm$25.49, Aug 10 - Sep 28$21.23, Aug 17 3:50 pm$15.80, Aug 17 3:50 pm$25.49, Aug 10 - Sep 28$21.20, Aug 21 10:31 am$15.64, Aug 21 10:31 am$25.49, Aug 10 - Sep 28$21.18, Aug 25 - Aug 28$15.63, Aug 25 4:20 am$25.49, Aug 10 - Sep 28$21.18, Aug 25 - Aug 28$15.48, Aug 28 10:59 pm$25.49, Aug 10 - Sep 28$21.17, Sep 1 3:52 pm$12.65, Sep 1 3:52 pm$25.49, Aug 10 - Sep 28$21.16, Sep 5 - Jan 3$14.58, Sep 5 1:13 pm$25.49, Aug 10 - Sep 28$21.16, Sep 5 - Jan 3$14.29, Sep 9 11:38 am$25.49, Aug 10 - Sep 28$21.16, Sep 5 - Jan 3$14.03, Sep 13 8:46 am$25.49, Aug 10 - Sep 28$21.16, Sep 5 - Jan 3$13.76, Sep 17 5:26 am$25.49, Aug 10 - Sep 28$21.16, Sep 5 - Jan 3$13.49, Sep 21 2:40 am$25.49, Aug 10 - Sep 28$21.16, Sep 5 - Jan 3$13.18, Sep 25 1:10 am$25.49, Aug 10 - Sep 28$21.16, Sep 5 - Jan 3$11.90, Sep 28 10:40 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$11.58, Oct 3 12:01 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$11.28, Oct 7 2:40 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$11.03, Oct 11 6:16 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$9.91, Oct 15 5:01 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$8.66, Oct 19 1:09 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$7.55, Oct 22 10:20 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$6.67, Oct 26 7:19 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$5.98, Oct 30 6:45 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$6.23, Nov 3 6:44 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$8.74, Nov 7 9:24 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$8.59, Nov 12 12:12 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$8.38, Nov 16 5:17 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$4.61, Nov 20 2:32 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$1.83, Nov 22 8:10 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$0.62, Nov 27 8:41 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$9.58, Dec 2 5:42 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$9.61, Dec 7 2:43 am$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$9.60, Dec 9 5:30 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$9.53, Dec 14 5:43 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$9.43, Dec 19 6:38 pm$29.95, Oct 3 - Dec 24$21.16, Sep 5 - Jan 3$9.47, Dec 24 1:31 pmOOS $28.45, Dec 29 3:09 pm$21.16, Sep 5 - Jan 3$10.19, Dec 29 3:09 pm$28.45, Jan 3 9:45 am$21.16, Sep 5 - Jan 3$15.95, Jan 3 9:45 amOOS $28.30, Jan 5 - Jan 8$21.16, Sep 5 - Jan 3$15.30, Jan 5 7:57 pmOOS $28.30, Jan 5 - Jan 8$28.25, Jan 8 7:46 am$21.16, Sep 5 - Jan 3$28.30, Jan 10 7:22 pm$28.30, Jan 10 7:22 pm$28.02, Jan 10 7:22 pm$28.15, Jan 15 6:27 pm$28.10, Jan 15 6:27 pm$28.02, Jan 10 7:22 pm$39.59, Jan 20 6:25 pm$28.02, Jan 10 7:22 pm$28.00, Jan 20 6:25 pm$37.34, Jan 23 7:50 am$28.02, Jan 10 7:22 pmOOS $28.00, Jan 23 7:50 am$27.85, Jan 28 9:55 am$27.01, Jan 28 - Mar 12$22.28, Jan 28 9:55 am$50.61, Feb 2 9:21 am$27.57, Feb 2 - Feb 7$27.01, Jan 28 - Mar 12$27.57, Feb 2 - Feb 7$27.01, Jan 28 - Mar 12$22.06, Feb 7 10:52 am$27.29, Feb 12 - Mar 12$27.01, Jan 28 - Mar 12$21.83, Feb 12 3:09 pm$27.29, Feb 12 - Mar 12$27.01, Jan 28 - Mar 12$17.82, Feb 18 1:02 am$27.29, Feb 12 - Mar 12$27.01, Jan 28 - Mar 12$17.47, Feb 23 2:41 pm$27.29, Feb 12 - Mar 12$27.01, Jan 28 - Mar 12$17.01, Feb 28 10:53 pm$27.29, Feb 12 - Mar 12$27.01, Jan 28 - Mar 12$15.08, Mar 12 11:16 pm$26.73, Mar 24 10:17 pm$18.00, Mar 24 - Apr 17$12.93, Mar 24 10:17 pm$26.62, Apr 5 - Apr 17$18.00, Mar 24 - Apr 17$10.83, Apr 5 10:00 am$26.62, Apr 5 - Apr 17$18.00, Mar 24 - Apr 17$8.92, Apr 17 2:55 am 30,6581,584,171 1,953,125 976,563 488,281 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun 2015 2016

Price Details

New

Latest $26.62 Apr 17, '16
Highest $29.95 Oct 3, '15
Lowest $25.49 Aug 10, '15
Average $26.67 (30d avg)
$27.25 (90d avg)
$28.44 (180d avg)
$27.85 (365d avg)
$27.95 (Lifetime average)
Added May 10, 2014

3rd Party New

Latest $18.00 Apr 17, '16
Highest $28.41 Dec 23, '14
Lowest $2.95 Feb 24, '15
Average $18.00 (30d avg)
$24.39 (90d avg)
$23.26 (180d avg)
$21.28 (365d avg)
$20.32 (Lifetime average)
Added May 10, 2014

3rd Party Used

Latest $8.92 Apr 17, '16
Highest $50.61 Feb 2, '16
Lowest $0.01 Oct 16, '14
Average $11.87 (30d avg)
$20.15 (90d avg)
$15.43 (180d avg)
$15.63 (365d avg)
$11.33 (Lifetime average)
Added May 10, 2014

Sales Rank

30 day average: 1,268,981
90 day average: 1,048,826

Product Description

examines the challenge of creating innovative and productive entrepreneurial activity in American education.

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