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  • Waves: Principles of Light, Electricity, and Magnetism (Secrets of the Universe)

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Buy from Amazon $25.32$0.01 $37.50 $12.50 Jul Sep Nov Jan Mar May Jul Sep Nov Jan Mar May 2014 2015 2016 $20.69, May 3 - May 8$18.28, May 4 10:36 am$4.24, May 4 10:36 am$20.69, May 3 - May 8$18.21, May 6 - May 8$4.14, May 6 11:33 am$20.69, May 3 - May 8$18.21, May 6 - May 8$4.06, May 8 12:59 am$20.05, May 8 - May 12$18.17, May 8 - May 10$3.94, May 10 7:22 am$20.05, May 8 - May 12$18.13, May 10 - May 12$8.59, May 12 2:48 am$20.01, May 12 - May 24$18.09, May 12 - May 13$8.30, May 13 10:21 am$20.01, May 12 - May 24$18.08, May 14 1:14 pm$8.03, May 14 1:14 pm$20.01, May 12 - May 24$18.05, May 15 10:24 pm$8.41, May 15 - May 20$20.01, May 12 - May 24$18.00, May 18 3:15 pm$8.41, May 15 - May 20$20.01, May 12 - May 24$17.93, May 20 - May 22$8.41, May 15 - May 20$20.01, May 12 - May 24$17.89, May 22 - May 24$11.92, May 22 4:04 pm$19.97, May 24 - May 26$17.85, May 24 - May 26$12.52, May 24 - May 25$20.01, May 26 - May 30$17.81, May 26 - May 28$12.49, May 26 - May 29$20.01, May 26 - May 30$17.77, May 29 3:39 am$12.49, May 26 - May 29$22.73, May 31 - Aug 28$17.73, May 31 4:26 am$12.39, May 31 7:25 pm$22.73, May 31 - Aug 28$17.69, Jun 2 - Jun 3$12.33, Jun 2 5:44 pm$22.73, May 31 - Aug 28$17.65, Jun 4 2:16 am$12.17, Jun 4 6:07 pm$22.73, May 31 - Aug 28$17.61, Jun 5 - Jun 18$12.11, Jun 5 2:57 pm$22.73, May 31 - Aug 28$17.61, Jun 5 - Jun 18$11.98, Jun 7 10:45 pm$22.73, May 31 - Aug 28$17.61, Jun 5 - Jun 18$11.87, Jun 10 12:53 am$22.73, May 31 - Aug 28$17.61, Jun 5 - Jun 18$11.70, Jun 12 5:47 am$22.73, May 31 - Aug 28$17.61, Jun 5 - Jun 18$11.59, Jun 13 6:24 pm$22.73, May 31 - Aug 28$17.61, Jun 5 - Jun 18$11.49, Jun 15 6:07 am$22.73, May 31 - Aug 28$17.61, Jun 5 - Jun 18$11.34, Jun 17 12:46 pm$22.73, May 31 - Aug 28$14.98, Jun 19 1:43 am$11.26, Jun 19 1:43 am$22.73, May 31 - Aug 28$14.95, Jun 19 - Jun 21$11.11, Jun 21 4:28 am$22.73, May 31 - Aug 28$14.90, Jun 22 - Jun 24$11.01, Jun 22 3:49 pm$22.73, May 31 - Aug 28$14.90, Jun 22 - Jun 24$10.94, Jun 24 - Jun 26$22.73, May 31 - Aug 28$14.85, Jun 25 - Jun 28$10.94, Jun 24 - Jun 26$22.73, May 31 - Aug 28$14.85, Jun 25 - Jun 28$10.81, Jun 28 3:13 am$22.73, May 31 - Aug 28$14.80, Jun 28 - Jul 1$10.55, Jun 30 10:54 am$22.73, May 31 - Aug 28$14.80, Jun 28 - Jul 1$10.43, Jul 1 11:48 am$22.73, May 31 - Aug 28$14.75, Jul 2 - Jul 3$10.17, Jul 3 9:06 pm$22.73, May 31 - Aug 28$9.13, Jul 5 - Jul 7$9.12, Jul 5 1:08 am$22.73, May 31 - Aug 28$9.13, Jul 5 - Jul 7$8.78, Jul 7 5:22 pm$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$8.69, Jul 8 10:42 pm$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$8.47, Jul 11 9:36 am$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$8.33, Jul 12 2:44 pm$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$7.91, Jul 15 3:07 am$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$7.56, Jul 16 2:44 pm$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$7.22, Jul 17 9:55 pm$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$6.68, Jul 20 6:07 am$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$6.46, Jul 21 4:01 am$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$6.04, Jul 23 10:40 am$22.73, May 31 - Aug 28$14.73, Jul 8 - Jul 26$5.58, Jul 25 8:58 am$22.73, May 31 - Aug 28$14.65, Jul 27 - Jul 30$5.06, Jul 27 9:50 pm$22.73, May 31 - Aug 28$14.65, Jul 27 - Jul 30$4.81, Jul 29 5:17 pm$22.73, May 31 - Aug 28$14.63, Jul 31 - Aug 7$4.69, Jul 31 12:04 pm$22.73, May 31 - Aug 28$14.63, Jul 31 - Aug 7$4.62, Aug 2 7:01 am$22.73, May 31 - Aug 28$14.63, Jul 31 - Aug 7$4.58, Aug 4 3:10 am$22.73, May 31 - Aug 28$14.63, Jul 31 - Aug 7$7.91, Aug 6 12:10 am$22.73, May 31 - Aug 28$14.63, Jul 31 - Aug 7$7.89, Aug 7 4:24 am$22.73, May 31 - Aug 28$14.63, Aug 9 7:23 am$10.15, Aug 9 7:23 am$22.73, May 31 - Aug 28$14.97, Aug 11 7:34 am$9.76, Aug 11 7:34 am$22.73, May 31 - Aug 28$14.92, Aug 13 2:49 am$9.40, Aug 13 2:49 am$22.73, May 31 - Aug 28$13.97, Aug 14 - Aug 15$10.41, Aug 15 1:34 am$22.73, May 31 - Aug 28$13.95, Aug 15 - Sep 15$10.40, Aug 15 11:43 pm$22.73, May 31 - Aug 28$13.95, Aug 15 - Sep 15$10.36, Aug 18 2:03 am$22.73, May 31 - Aug 28$13.95, Aug 15 - Sep 15$10.29, Aug 20 8:53 am$22.73, May 31 - Aug 28$13.95, Aug 15 - Sep 15$10.18, Aug 22 6:57 am$22.73, May 31 - Aug 28$13.95, Aug 15 - Sep 15$10.13, Aug 23 7:03 am$22.73, May 31 - Aug 28$13.95, Aug 15 - Sep 15$9.78, Aug 25 10:36 am$22.73, May 31 - Aug 28$13.95, Aug 15 - Sep 15$9.58, Aug 27 1:58 pm$21.46, Aug 29 - Sep 7$13.95, Aug 15 - Sep 15$9.44, Aug 29 7:14 pm$21.46, Aug 29 - Sep 7$13.95, Aug 15 - Sep 15$9.32, Aug 31 1:29 am$21.46, Aug 29 - Sep 7$13.95, Aug 15 - Sep 15$9.25, Sep 1 7:16 am$21.46, Aug 29 - Sep 7$13.95, Aug 15 - Sep 15$9.01, Sep 3 4:01 pm$21.46, Aug 29 - Sep 7$13.95, Aug 15 - Sep 15$8.79, Sep 6 1:54 am$21.46, Aug 29 - Sep 7$13.95, Aug 15 - Sep 15$8.69, Sep 7 7:14 am$21.66, Sep 8 - Sep 20$13.95, Aug 15 - Sep 15$8.42, Sep 9 4:48 pm$21.66, Sep 8 - Sep 20$13.95, Aug 15 - Sep 15$8.31, Sep 10 8:47 pm$21.66, Sep 8 - Sep 20$13.95, Aug 15 - Sep 15$8.07, Sep 13 6:34 am$21.66, Sep 8 - Sep 20$13.95, Aug 15 - Sep 15$7.83, Sep 15 7:27 am$21.66, Sep 8 - Sep 20$13.97, Sep 19 - Apr 24$7.31, Sep 20 10:27 am$21.59, Sep 22 - Oct 5$13.97, Sep 19 - Apr 24$7.09, Sep 22 5:12 pm$21.59, Sep 22 - Oct 5$13.97, Sep 19 - Apr 24$6.90, Sep 24 9:55 pm$21.59, Sep 22 - Oct 5$13.97, Sep 19 - Apr 24$6.69, Sep 27 12:32 am$21.59, Sep 22 - Oct 5$13.97, Sep 19 - Apr 24$6.43, Sep 29 12:54 am$21.59, Sep 22 - Oct 5$13.97, Sep 19 - Apr 24$6.22, Oct 1 2:24 am$21.59, Sep 22 - Oct 5$13.97, Sep 19 - Apr 24$6.06, Oct 3 5:58 am$21.59, Sep 22 - Oct 5$13.97, Sep 19 - Apr 24$5.85, Oct 5 11:06 am$20.94, Oct 7 - Oct 14$13.97, Sep 19 - Apr 24$5.65, Oct 7 1:17 pm$20.94, Oct 7 - Oct 14$13.97, Sep 19 - Apr 24$5.43, Oct 9 4:49 pm$20.94, Oct 7 - Oct 14$13.97, Sep 19 - Apr 24$5.20, Oct 11 6:40 pm$20.94, Oct 7 - Oct 14$13.97, Sep 19 - Apr 24$4.99, Oct 13 9:20 pm$20.92, Oct 16 - Oct 29$13.97, Sep 19 - Apr 24$4.90, Oct 16 2:45 am$20.92, Oct 16 - Oct 29$13.97, Sep 19 - Apr 24$4.82, Oct 18 6:13 am$20.92, Oct 16 - Oct 29$13.97, Sep 19 - Apr 24$4.97, Oct 21 2:09 pm$20.92, Oct 16 - Oct 29$13.97, Sep 19 - Apr 24$4.96, Oct 23 9:19 pm$20.92, Oct 16 - Oct 29$13.97, Sep 19 - Apr 24$4.90, Oct 29 3:50 pm$21.43, Nov 4 4:28 am$13.97, Sep 19 - Apr 24$4.61, Nov 4 4:28 am$21.33, Nov 10 - Nov 12$13.97, Sep 19 - Apr 24$4.51, Nov 10 7:00 am$21.33, Nov 10 - Nov 12$13.97, Sep 19 - Apr 24$4.43, Nov 12 10:33 pm$21.49, Nov 17 3:29 am$13.97, Sep 19 - Apr 24$6.79, Nov 17 - Nov 27$21.24, Nov 19 - Nov 25$13.97, Sep 19 - Apr 24$6.79, Nov 17 - Nov 27$20.79, Nov 27 - Dec 5$13.97, Sep 19 - Apr 24$6.79, Nov 17 - Nov 27$20.79, Nov 27 - Dec 5$13.97, Sep 19 - Apr 24$6.68, Nov 29 10:21 am$20.79, Nov 27 - Dec 5$13.97, Sep 19 - Apr 24$6.56, Dec 1 9:14 am$20.79, Nov 27 - Dec 5$13.97, Sep 19 - Apr 24$6.44, Dec 3 7:45 am$20.79, Nov 27 - Dec 5$13.97, Sep 19 - Apr 24$6.32, Dec 5 5:18 am$20.93, Dec 7 - Dec 11$13.97, Sep 19 - Apr 24$6.21, Dec 7 2:58 am$20.93, Dec 7 - Dec 11$13.97, Sep 19 - Apr 24$6.08, Dec 9 4:36 am$20.93, Dec 7 - Dec 11$13.97, Sep 19 - Apr 24$4.53, Dec 11 7:35 am$20.77, Dec 13 - Dec 26$13.97, Sep 19 - Apr 24$4.41, Dec 13 7:24 am$20.77, Dec 13 - Dec 26$13.97, Sep 19 - Apr 24$4.29, Dec 15 6:15 am$20.77, Dec 13 - Dec 26$13.97, Sep 19 - Apr 24$4.17, Dec 17 6:00 am$20.77, Dec 13 - Dec 26$13.97, Sep 19 - Apr 24$6.78, Dec 24 - Dec 25$20.77, Dec 13 - Dec 26$13.97, Sep 19 - Apr 24$6.79, Dec 26 5:33 am$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$6.72, Dec 27 12:21 pm$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$6.79, Dec 29 2:43 am$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$6.74, Dec 30 6:38 pm$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$6.14, Jan 1 9:20 am$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$3.97, Jan 10 8:41 pm$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$3.63, Jan 13 4:05 pm$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$3.46, Jan 15 10:44 am$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$2.99, Jan 17 3:25 am$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$2.56, Jan 18 7:29 pm$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$1.93, Jan 20 11:06 am$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$1.21, Jan 22 2:22 am$20.95, Dec 27 - Jan 23$13.97, Sep 19 - Apr 24$0.66, Jan 23 3:10 pm$21.24, Jan 25 6:21 am$13.97, Sep 19 - Apr 24$0.01, Jan 25 - Mar 3$20.51, Jan 27 - Feb 2$13.97, Sep 19 - Apr 24$0.01, Jan 25 - Mar 3$20.01, Feb 3 - Mar 14$13.97, Sep 19 - Apr 24$0.01, Jan 25 - Mar 3$20.01, Feb 3 - Mar 14$13.97, Sep 19 - Apr 24$0.94, Mar 5 1:53 pm$20.01, Feb 3 - Mar 14$13.97, Sep 19 - Apr 24$0.44, Mar 7 2:42 pm$20.01, Feb 3 - Mar 14$13.97, Sep 19 - Apr 24$0.28, Mar 9 - Mar 12$20.01, Feb 3 - Mar 14$13.97, Sep 19 - Apr 24$0.15, Mar 14 9:29 am$19.99, Mar 17 - Mar 31$13.97, Sep 19 - Apr 24$0.01, Mar 17 8:26 am$19.99, Mar 17 - Mar 31$13.97, Sep 19 - Apr 24$0.79, Mar 19 1:22 pm$19.99, Mar 17 - Mar 31$13.97, Sep 19 - Apr 24$0.86, Mar 21 6:28 pm$19.99, Mar 17 - Mar 31$13.97, Sep 19 - Apr 24$0.84, Mar 24 1:43 am$19.99, Mar 17 - Mar 31$13.97, Sep 19 - Apr 24$0.85, Mar 26 8:14 am$19.99, Mar 17 - Mar 31$13.97, Sep 19 - Apr 24$7.78, Mar 28 - Mar 31$20.28, Apr 2 - Apr 24$13.97, Sep 19 - Apr 24$7.74, Apr 2 - Apr 7$20.28, Apr 2 - Apr 24$13.97, Sep 19 - Apr 24$7.78, Apr 10 - Apr 13$20.28, Apr 2 - Apr 24$13.97, Sep 19 - Apr 24$7.53, Apr 16 4:18 am$20.28, Apr 2 - Apr 24$13.97, Sep 19 - Apr 24$6.81, Apr 18 5:21 pm$20.28, Apr 2 - Apr 24$13.97, Sep 19 - Apr 24$5.42, Apr 21 9:52 am$20.28, Apr 2 - Apr 24$13.97, Sep 19 - Apr 24$1.46, Apr 24 5:13 am$20.28, Apr 27 8:26 am$13.97, Apr 27 - Oct 14$0.82, Apr 27 8:26 am$20.27, Apr 30 - May 1$13.97, Apr 27 - Oct 14$0.50, May 1 4:18 pm$20.47, May 4 7:28 am$13.97, Apr 27 - Oct 14$0.52, May 4 7:28 am$20.87, May 7 - May 11$13.97, Apr 27 - Oct 14$0.50, May 7 - May 14$20.80, May 14 - May 22$13.97, Apr 27 - Oct 14$0.50, May 7 - May 14$20.80, May 14 - May 22$13.97, Apr 27 - Oct 14$0.57, May 18 12:49 pm$20.80, May 14 - May 22$13.97, Apr 27 - Oct 14$0.51, May 22 - May 27$21.07, May 27 - Jun 5$13.97, Apr 27 - Oct 14$0.51, May 22 - May 27$21.07, May 27 - Jun 5$13.97, Apr 27 - Oct 14$0.47, May 31 3:03 pm$21.07, May 27 - Jun 5$13.97, Apr 27 - Oct 14$0.50, Jun 5 - Jun 9$21.05, Jun 9 - Jun 13$13.97, Apr 27 - Oct 14$0.50, Jun 5 - Jun 9$21.05, Jun 9 - Jun 13$13.97, Apr 27 - Oct 14$0.48, Jun 13 8:28 am$22.00, Jun 17 - Jun 24$13.97, Apr 27 - Oct 14$0.49, Jun 17 - Jun 24$21.21, Jun 28 - Jul 7$13.97, Apr 27 - Oct 14$0.51, Jun 28 5:41 pm$21.21, Jun 28 - Jul 7$13.97, Apr 27 - Oct 14$0.97, Jul 2 8:59 pm$21.21, Jun 28 - Jul 7$13.97, Apr 27 - Oct 14$1.79, Jul 7 4:02 am$21.13, Jul 12 - Jul 25$13.97, Apr 27 - Oct 14$7.85, Jul 12 5:32 pm$21.13, Jul 12 - Jul 25$13.97, Apr 27 - Oct 14$0.47, Jul 16 9:11 am$21.13, Jul 12 - Jul 25$13.97, Apr 27 - Oct 14$0.41, Jul 18 5:40 am$21.13, Jul 12 - Jul 25$13.97, Apr 27 - Oct 14$0.99, Jul 21 - Jul 29$21.19, Jul 29 - Aug 3$13.97, Apr 27 - Oct 14$0.99, Jul 21 - Jul 29$21.19, Jul 29 - Aug 3$13.97, Apr 27 - Oct 14$1.00, Jul 30 - Aug 7$21.30, Aug 7 - Aug 10$13.97, Apr 27 - Oct 14$1.00, Jul 30 - Aug 7$21.30, Aug 7 - Aug 10$17.08, Aug 10 - Aug 20$13.97, Apr 27 - Oct 14$21.29, Aug 12 - Aug 16$17.08, Aug 10 - Aug 20$13.97, Apr 27 - Oct 14$21.80, Aug 20 - Aug 24$17.08, Aug 10 - Aug 20$13.97, Apr 27 - Oct 14$21.80, Aug 20 - Aug 24$13.97, Apr 27 - Oct 14$13.96, Aug 24 1:37 am$22.01, Aug 27 - Sep 23$13.97, Apr 27 - Oct 14$13.92, Aug 27 8:47 pm$22.01, Aug 27 - Sep 23$13.97, Apr 27 - Oct 14$13.96, Aug 31 - Sep 8$22.01, Aug 27 - Sep 23$13.97, Apr 27 - Oct 14$13.83, Sep 12 5:34 am$22.01, Aug 27 - Sep 23$13.97, Apr 27 - Oct 14$13.96, Sep 16 3:05 am$22.01, Aug 27 - Sep 23$13.97, Apr 27 - Oct 14$13.70, Sep 19 11:53 pm$22.01, Aug 27 - Sep 23$13.97, Apr 27 - Oct 14$13.52, Sep 23 10:30 pm$21.58, Sep 27 7:35 pm$13.97, Apr 27 - Oct 14$1.46, Sep 27 7:35 pm$25.32, Oct 1 - Mar 28$13.97, Apr 27 - Oct 14$1.15, Oct 1 8:05 pm$25.32, Oct 1 - Mar 28$13.97, Apr 27 - Oct 14$0.83, Oct 5 10:36 pm$25.32, Oct 1 - Mar 28$13.97, Apr 27 - Oct 14$0.57, Oct 10 2:08 am$25.32, Oct 1 - Mar 28$13.97, Apr 27 - Oct 14$0.23, Oct 14 2:04 am$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$8.21, Oct 17 10:37 pm$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$17.08, Oct 21 - Nov 8$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$0.05, Nov 12 10:57 pm$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$16.79, Nov 17 5:56 am$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$16.38, Nov 21 2:45 pm$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$15.97, Nov 26 1:17 am$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$15.41, Nov 30 8:39 pm$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$14.58, Dec 5 5:26 pm$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$13.89, Dec 10 8:11 pm$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$13.59, Dec 15 9:16 pm$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$1.10, Dec 20 7:29 pm$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$0.91, Dec 26 9:49 am$25.32, Oct 1 - Mar 28$21.29, Oct 17 - Jan 9$13.97, Dec 31 - Jan 9$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$13.66, Jan 14 12:14 pm$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$13.60, Jan 19 12:19 pm$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$0.45, Jan 24 1:17 pm$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$0.25, Jan 29 2:01 pm$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$5.13, Feb 3 3:16 pm$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$4.99, Feb 8 5:22 pm$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$13.00, Feb 13 11:23 pm$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$12.66, Feb 19 7:39 am$25.32, Oct 1 - Mar 28$21.28, Jan 14 - Feb 24$13.97, Feb 24 8:14 pm$25.32, Oct 1 - Mar 28$20.11, Mar 5 9:19 am$4.87, Mar 5 9:19 am$25.32, Oct 1 - Mar 28$17.95, Mar 16 11:26 pm$3.19, Mar 16 11:26 pm$25.32, Oct 1 - Mar 28$19.48, Mar 28 11:41 am$0.01, Mar 28 11:41 am 72,9981,723,009 1,953,125 1,562,500 1,171,875 781,250 390,625 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr 2015 2016

Price Details

New

Latest $25.32 Mar 28, '16
Highest $25.32 Oct 1, '15
Lowest $19.97 May 24, '14
Average $25.32 (30d avg)
$25.32 (90d avg)
$25.32 (180d avg)
$23.20 (365d avg)
$22.30 (Lifetime average)
Added May 3, 2014

3rd Party New

Latest $19.48 Mar 28, '16
Highest $21.29 Oct 17, '15
Lowest $9.13 Jul 5, '14
Average $19.03 (30d avg)
$20.71 (90d avg)
$20.29 (180d avg)
$17.09 (365d avg)
$15.90 (Lifetime average)
Added May 3, 2014

3rd Party Used

Latest $0.01 Mar 28, '16
Highest $17.08 Oct 21, '15
Lowest $0.01 Mar 28, '16
Average $4.03 (30d avg)
$8.60 (90d avg)
$9.53 (180d avg)
$7.42 (365d avg)
$6.73 (Lifetime average)
Added May 3, 2014

Sales Rank

30 day average: 1,329,030
90 day average: 1,099,090

Product Description

Discusses the scientific principles behind the laws of light, electromagnetism, and electric current, and explains Ohm's law and Joule's law.

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