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$27.55, Sep 14 10:02 pm $24.83, Nov 19 12:54 am $28.34, Nov 23 - Dec 16 $26.47, Dec 18 - Jan 1 $26.33, Jan 2 - Jan 27 $26.19, Jan 27 - Feb 7 $25.92, Feb 7 - Apr 7 $27.07, Apr 7 - Apr 26 $28.34, Apr 27 - May 6 $28.34, Apr 27 - May 6 $19.79, May 3 - May 24 $14.35, May 3 - May 23 $25.92, May 7 - Jun 21 $19.79, May 3 - May 24 $14.35, May 3 - May 23 $25.92, May 7 - Jun 21 $19.75, May 25 4:33 pm $11.00, May 23 - May 27 $25.92, May 7 - Jun 21 $19.62, May 28 5:42 am $10.97, May 28 5:42 am $25.92, May 7 - Jun 21 $19.53, May 30 - Jun 1 $10.67, May 30 - Jun 1 $25.92, May 7 - Jun 21 $19.45, Jun 2 12:02 pm $10.51, Jun 1 - Jun 4 $25.92, May 7 - Jun 21 $19.43, Jun 3 - Jun 5 $10.51, Jun 1 - Jun 4 $25.92, May 7 - Jun 21 $19.28, Jun 7 11:12 am $10.44, Jun 5 - Jun 7 $25.92, May 7 - Jun 21 $19.20, Jun 9 11:49 am $11.00, Jun 9 11:49 am $25.92, May 7 - Jun 21 $18.96, Jun 12 10:10 am $7.25, Jun 10 - Jun 13 $25.92, May 7 - Jun 21 $18.75, Jun 14 4:55 pm $7.24, Jun 13 - Jun 18 $25.92, May 7 - Jun 21 $18.73, Jun 15 - Jun 16 $7.24, Jun 13 - Jun 18 $25.92, May 7 - Jun 21 $18.70, Jun 19 - Dec 17 $8.13, Jun 20 12:10 am $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.67, Jun 21 - Jun 22 $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.65, Jun 24 - Jun 25 $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.62, Jun 27 2:33 am $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.58, Jun 29 - Jun 30 $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.55, Jul 2 1:19 am $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.52, Jul 4 9:34 am $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.47, Jul 6 6:55 pm $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.44, Jul 9 9:20 am $28.34, Jun 22 - Jul 13 $18.70, Jun 19 - Dec 17 $8.35, Jul 11 8:06 pm $27.37, Jul 14 - Jul 23 $18.70, Jun 19 - Dec 17 $8.22, Jul 14 10:58 am $27.37, Jul 14 - Jul 23 $18.70, Jun 19 - Dec 17 $8.10, Jul 17 3:56 am $27.37, Jul 14 - Jul 23 $18.70, Jun 19 - Dec 17 $7.93, Jul 19 4:47 pm $27.37, Jul 14 - Jul 23 $18.70, Jun 19 - Dec 17 $7.86, Jul 21 2:22 pm $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $7.71, Jul 24 5:33 pm $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $7.56, Jul 27 10:48 am $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $6.50, Jul 29 7:55 am $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $6.34, Aug 1 1:44 am $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $6.19, Aug 3 7:59 pm $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $6.04, Aug 5 4:23 pm $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $4.89, Aug 8 9:40 pm $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $4.71, Aug 10 9:27 pm $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $4.43, Aug 13 6:05 pm $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $4.16, Aug 16 6:18 am $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $3.98, Aug 18 8:29 am $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $3.94, Aug 20 4:24 pm $27.29, Jul 24 - Aug 23 $18.70, Jun 19 - Dec 17 $3.88, Aug 23 5:03 pm $27.01, Aug 24 - Aug 31 $18.70, Jun 19 - Dec 17 $3.84, Aug 25 7:32 pm $27.01, Aug 24 - Aug 31 $18.70, Jun 19 - Dec 17 $3.80, Aug 28 - Aug 29 $27.01, Aug 24 - Aug 31 $18.70, Jun 19 - Dec 17 $3.79, Aug 30 9:07 am $27.37, Sep 1 - Sep 6 $18.70, Jun 19 - Dec 17 $3.70, Sep 2 11:06 pm $27.37, Sep 1 - Sep 6 $18.70, Jun 19 - Dec 17 $3.65, Sep 5 8:51 am $27.64, Sep 7 - Sep 13 $18.70, Jun 19 - Dec 17 $3.94, Sep 6 - Sep 7 $27.64, Sep 7 - Sep 13 $18.70, Jun 19 - Dec 17 $3.87, Sep 10 3:18 am $27.64, Sep 7 - Sep 13 $18.70, Jun 19 - Dec 17 $3.80, Sep 12 1:14 pm $27.64, Sep 7 - Sep 13 $18.70, Jun 19 - Dec 17 $3.77, Sep 13 7:12 pm $27.91, Sep 15 - Sep 23 $18.70, Jun 19 - Dec 17 $3.73, Sep 15 10:19 pm $27.91, Sep 15 - Sep 23 $18.70, Jun 19 - Dec 17 $3.94, Sep 18 - Sep 23 $28.18, Sep 24 - Sep 28 $18.70, Jun 19 - Dec 17 $3.93, Sep 24 - Oct 14 $28.34, Sep 30 - Oct 29 $18.70, Jun 19 - Dec 17 $3.93, Sep 24 - Oct 14 $28.34, Sep 30 - Oct 29 $18.70, Jun 19 - Dec 17 $3.95, Oct 16 - Oct 19 $28.34, Sep 30 - Oct 29 $18.70, Jun 19 - Dec 17 $6.95, Oct 21 - Oct 23 $28.34, Sep 30 - Oct 29 $18.70, Jun 19 - Dec 17 $7.99, Oct 29 6:27 pm $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $7.07, Nov 4 7:14 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $4.37, Nov 10 10:51 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $5.67, Nov 15 7:08 pm $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $4.00, Nov 18 11:15 pm $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $2.78, Nov 21 2:31 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $5.89, Nov 23 3:38 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $5.67, Nov 25 8:14 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $6.00, Nov 29 3:36 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $6.38, Dec 1 - Dec 4 $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $6.02, Dec 8 8:36 pm $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $5.87, Dec 11 2:16 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $5.52, Dec 14 12:29 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $5.37, Dec 16 12:42 am $27.89, Nov 4 - Dec 22 $18.70, Jun 19 - Dec 17 $5.22, Dec 17 11:13 pm $28.03, Dec 23 - Dec 28 $25.06, Dec 22 - Dec 31 $4.61, Dec 24 2:29 am $28.03, Dec 23 - Dec 28 $25.06, Dec 22 - Dec 31 $3.55, Dec 25 5:35 pm $28.03, Dec 23 - Dec 28 $25.06, Dec 22 - Dec 31 $3.06, Dec 28 10:03 pm $27.88, Dec 30 - Jan 4 $25.06, Dec 22 - Dec 31 $6.00, Dec 30 8:44 am $27.88, Dec 30 - Jan 4 $24.14, Jan 1 - Feb 23 $10.00, Jan 1 7:04 pm $27.73, Jan 5 - Jan 10 $24.14, Jan 1 - Feb 23 $10.99, Jan 3 - Jan 5 $27.73, Jan 5 - Jan 10 $24.14, Jan 1 - Feb 23 $10.73, Jan 8 3:16 am $27.73, Jan 5 - Jan 10 $24.14, Jan 1 - Feb 23 $10.69, Jan 9 4:01 pm $27.59, Jan 12 - Jan 18 $24.14, Jan 1 - Feb 23 $10.62, Jan 12 9:27 pm $27.59, Jan 12 - Jan 18 $24.14, Jan 1 - Feb 23 $10.59, Jan 14 2:35 pm $27.59, Jan 12 - Jan 18 $24.14, Jan 1 - Feb 23 $11.00, Jan 16 - Jan 20 $27.45, Jan 19 - Jan 20 $24.14, Jan 1 - Feb 23 $11.00, Jan 16 - Jan 20 $27.03, Feb 3 - Apr 4 $24.14, Jan 1 - Feb 23 $10.67, Feb 3 - Feb 5 $27.03, Feb 3 - Apr 4 $24.14, Jan 1 - Feb 23 $10.56, Feb 7 - Feb 9 $27.03, Feb 3 - Apr 4 $24.14, Jan 1 - Feb 23 $10.42, Feb 10 7:51 pm $27.03, Feb 3 - Apr 4 $24.14, Jan 1 - Feb 23 $9.51, Feb 14 12:10 pm $27.03, Feb 3 - Apr 4 $24.14, Jan 1 - Feb 23 $9.02, Feb 15 10:52 am $27.03, Feb 3 - Apr 4 $24.14, Jan 1 - Feb 23 $8.05, Feb 19 7:33 am $27.03, Feb 3 - Apr 4 $24.14, Jan 1 - Feb 23 $7.80, Feb 21 5:24 am $27.03, Feb 3 - Apr 4 $24.14, Jan 1 - Feb 23 $7.42, Feb 23 3:41 am $27.03, Feb 3 - Apr 4 $23.81, Feb 25 - Mar 19 $7.00, Feb 26 11:16 pm $27.03, Feb 3 - Apr 4 $23.81, Feb 25 - Mar 19 $6.71, Feb 28 8:34 pm $27.03, Feb 3 - Apr 4 $23.81, Feb 25 - Mar 19 $6.43, Mar 3 9:31 am $27.03, Feb 3 - Apr 4 $23.81, Feb 25 - Mar 19 $6.16, Mar 5 9:56 am $27.03, Feb 3 - Apr 4 $23.81, Feb 25 - Mar 19 $5.84, Mar 7 10:42 am $27.03, Feb 3 - Apr 4 $23.81, Feb 25 - Mar 19 $5.63, Mar 9 10:28 am $27.03, Feb 3 - Apr 4 $23.81, Feb 25 - Mar 19 $5.17, Mar 14 2:53 am $27.03, Feb 3 - Apr 4 $23.81, Feb 25 - Mar 19 $4.74, Mar 17 3:57 am $27.03, Feb 3 - Apr 4 $23.41, Mar 21 - Apr 8 $4.58, Mar 21 12:01 pm $27.03, Feb 3 - Apr 4 $23.41, Mar 21 - Apr 8 $4.54, Mar 23 6:03 pm $27.03, Feb 3 - Apr 4 $23.41, Mar 21 - Apr 8 $4.50, Mar 26 1:37 am $27.03, Feb 3 - Apr 4 $23.41, Mar 21 - Apr 8 $5.61, Mar 28 - Mar 30 $27.03, Feb 3 - Apr 4 $23.41, Mar 21 - Apr 8 $5.44, Apr 2 5:55 am $27.03, Feb 3 - Apr 4 $23.41, Mar 21 - Apr 8 $5.43, Apr 4 8:06 pm $26.76, Apr 6 - Apr 10 $23.41, Mar 21 - Apr 8 $5.44, Apr 6 - Apr 8 $26.76, Apr 6 - Apr 10 $23.74, Apr 10 - Apr 14 $7.56, Apr 10 6:30 am $26.49, Apr 13 - Apr 17 $23.74, Apr 10 - Apr 14 $7.33, Apr 13 - Apr 14 $26.49, Apr 13 - Apr 17 $23.39, Apr 17 - Apr 25 $7.56, Apr 17 3:12 am $26.22, Apr 19 - Apr 22 $23.39, Apr 17 - Apr 25 $7.33, Apr 19 6:25 pm $26.22, Apr 19 - Apr 22 $23.39, Apr 17 - Apr 25 $7.11, Apr 22 10:28 am $26.87, Apr 25 7:39 am $23.39, Apr 17 - Apr 25 $6.90, Apr 25 7:39 am $26.87, Apr 28 - Apr 29 $23.39, Apr 28 - Apr 29 $7.56, Apr 28 - Apr 29 $27.54, May 2 - May 12 $23.55, May 2 - May 5 $8.51, May 2 - May 5 $27.54, May 2 - May 12 $22.30, May 9 - May 23 $7.29, May 9 12:20 am $27.54, May 2 - May 12 $22.30, May 9 - May 23 $6.33, May 12 6:57 am $27.75, May 15 - May 19 $22.30, May 9 - May 23 $6.07, May 15 3:16 pm $27.75, May 15 - May 19 $22.30, May 9 - May 23 $4.97, May 19 9:01 pm $27.47, May 23 - Jun 1 $22.30, May 9 - May 23 $5.32, May 23 11:50 pm $27.47, May 23 - Jun 1 $21.20, May 28 - Jun 6 $5.21, May 28 7:38 am $27.47, May 23 - Jun 1 $21.20, May 28 - Jun 6 $5.04, Jun 1 10:35 pm $27.19, Jun 6 - Jun 10 $21.20, May 28 - Jun 6 $4.72, Jun 6 2:06 pm $27.19, Jun 6 - Jun 10 $21.19, Jun 10 6:08 pm $4.56, Jun 10 6:08 pm $26.91, Jun 12 - Jun 16 $21.01, Jun 12 5:46 pm $4.41, Jun 12 5:46 pm $26.91, Jun 12 - Jun 16 $20.99, Jun 16 12:30 pm $4.25, Jun 16 12:30 pm $26.64, Jun 20 - Jun 24 $20.95, Jun 20 - Jun 24 $4.00, Jun 20 7:30 am $26.64, Jun 20 - Jun 24 $20.95, Jun 20 - Jun 24 $3.79, Jun 24 2:06 am OOS $26.37, Jun 28 1:37 am $20.91, Jun 28 1:37 am $3.78, Jun 28 1:37 am $26.37, Jul 2 3:20 am $20.90, Jul 2 - Jul 6 $3.76, Jul 2 3:20 am $26.10, Jul 6 10:06 am $20.90, Jul 2 - Jul 6 $3.72, Jul 6 10:06 am $25.90, Jul 12 - Jul 25 $20.86, Jul 14 2:50 am $3.67, Jul 12 - Jul 14 $25.90, Jul 12 - Jul 25 $20.85, Jul 16 - Jul 19 $5.50, Jul 16 1:17 am $25.90, Jul 12 - Jul 25 $20.85, Jul 16 - Jul 19 $5.73, Jul 19 4:33 pm $25.90, Jul 12 - Jul 25 $20.82, Jul 23 - Jul 25 $5.97, Jul 23 6:47 am $25.90, Jul 12 - Jul 25 $20.82, Jul 23 - Jul 25 $6.25, Jul 25 3:18 am $27.69, Jul 28 - Aug 1 $20.78, Jul 28 4:32 pm $6.91, Jul 28 - Aug 1 $27.69, Jul 28 - Aug 1 $20.74, Aug 1 - Aug 16 $6.91, Jul 28 - Aug 1 $27.96, Aug 4 10:44 pm $20.74, Aug 1 - Aug 16 $7.75, Aug 4 10:44 pm $28.24, Aug 8 - Aug 12 $20.74, Aug 1 - Aug 16 $8.20, Aug 8 4:00 pm $28.24, Aug 8 - Aug 12 $20.74, Aug 1 - Aug 16 $8.51, Aug 12 10:50 am $28.52, Aug 16 - Aug 19 $20.74, Aug 1 - Aug 16 $9.77, Aug 16 - Aug 27 $28.52, Aug 16 - Aug 19 $20.72, Aug 19 - Aug 27 $9.77, Aug 16 - Aug 27 $27.37, Aug 23 - Aug 27 $20.72, Aug 19 - Aug 27 $9.77, Aug 16 - Aug 27 $26.27, Aug 31 - Sep 4 $20.71, Aug 31 4:36 am $9.76, Aug 31 4:36 am $26.27, Aug 31 - Sep 4 $20.69, Sep 4 - Sep 27 $9.77, Sep 4 1:09 am $25.36, Sep 7 - Sep 23 $20.69, Sep 4 - Sep 27 $10.50, Sep 7 11:21 pm $25.36, Sep 7 - Sep 23 $20.69, Sep 4 - Sep 27 $10.15, Sep 11 8:32 pm $25.36, Sep 7 - Sep 23 $20.69, Sep 4 - Sep 27 $9.35, Sep 15 5:44 pm $25.36, Sep 7 - Sep 23 $20.69, Sep 4 - Sep 27 $8.75, Sep 19 2:08 pm $25.36, Sep 7 - Sep 23 $20.69, Sep 4 - Sep 27 $8.25, Sep 23 12:54 pm $25.90, Sep 27 10:45 am $20.69, Sep 4 - Sep 27 $7.85, Sep 27 10:45 am $26.77, Oct 1 - Nov 10 $20.68, Oct 1 - Oct 3 $7.25, Oct 1 11:03 am $26.77, Oct 1 - Nov 10 $20.68, Oct 1 - Oct 3 $6.90, Oct 3 12:42 pm $26.77, Oct 1 - Nov 10 $20.67, Oct 7 3:13 pm $6.19, Oct 7 3:13 pm $26.77, Oct 1 - Nov 10 $20.65, Oct 11 5:53 pm $5.65, Oct 11 5:53 pm $26.77, Oct 1 - Nov 10 $20.63, Oct 15 4:16 pm $4.90, Oct 15 4:16 pm $26.77, Oct 1 - Nov 10 $20.62, Oct 19 12:50 pm $4.00, Oct 19 12:50 pm $26.77, Oct 1 - Nov 10 $20.61, Oct 23 10:18 am $2.90, Oct 23 10:18 am $26.77, Oct 1 - Nov 10 $20.60, Oct 27 7:53 am $7.64, Oct 27 7:53 am $26.77, Oct 1 - Nov 10 $20.58, Oct 31 7:34 am $10.14, Oct 31 7:34 am $26.77, Oct 1 - Nov 10 $20.57, Nov 2 7:32 am $9.84, Nov 2 7:32 am $26.77, Oct 1 - Nov 10 $20.56, Nov 6 - Nov 18 $9.54, Nov 6 10:44 am $26.77, Oct 1 - Nov 10 $20.56, Nov 6 - Nov 18 $8.97, Nov 10 1:03 pm $28.08, Nov 14 - Nov 18 $20.56, Nov 6 - Nov 18 $8.70, Nov 14 3:09 pm $28.08, Nov 14 - Nov 18 $20.56, Nov 6 - Nov 18 $8.44, Nov 18 11:54 pm $28.36, Nov 23 - Dec 17 $20.54, Nov 23 9:48 am $9.84, Nov 23 - Dec 2 $28.36, Nov 23 - Dec 17 $20.53, Nov 27 11:59 pm $9.84, Nov 23 - Dec 2 $28.36, Nov 23 - Dec 17 $20.52, Dec 2 - Dec 17 $9.84, Nov 23 - Dec 2 $28.36, Nov 23 - Dec 17 $20.52, Dec 2 - Dec 17 $7.95, Dec 7 6:46 pm $28.36, Nov 23 - Dec 17 $20.52, Dec 2 - Dec 17 $7.88, Dec 12 8:39 pm $28.36, Nov 23 - Dec 17 $20.52, Dec 2 - Dec 17 $7.74, Dec 17 9:38 pm $28.64, Dec 20 - Dec 22 $20.51, Dec 20 10:37 am $7.72, Dec 20 10:37 am $28.64, Dec 20 - Dec 22 $20.49, Dec 22 10:30 pm $7.69, Dec 22 10:30 pm $28.49, Dec 28 6:32 am $20.43, Dec 28 6:32 am $7.60, Dec 28 6:32 am $28.34, Jan 1 - Jan 6 $20.41, Jan 1 11:38 pm $7.43, Jan 1 11:38 pm $28.34, Jan 1 - Jan 6 $20.40, Jan 6 8:13 pm $7.03, Jan 6 8:13 pm $26.92, Jan 11 5:24 pm $20.37, Jan 11 - Jan 16 $3.83, Jan 11 5:24 pm $26.89, Jan 16 - Mar 10 $20.37, Jan 11 - Jan 16 $3.62, Jan 16 4:18 pm $26.89, Jan 16 - Mar 10 $20.33, Jan 21 4:49 pm $3.27, Jan 21 4:49 pm $26.89, Jan 16 - Mar 10 $20.29, Jan 26 6:18 pm $2.92, Jan 26 6:18 pm $26.89, Jan 16 - Mar 10 $20.26, Jan 29 7:58 am $2.90, Jan 29 7:58 am $26.89, Jan 16 - Mar 10 $20.25, Jan 31 8:20 pm $2.85, Jan 31 8:20 pm $26.89, Jan 16 - Mar 10 $20.23, Feb 5 11:59 pm $2.28, Feb 5 11:59 pm $26.89, Jan 16 - Mar 10 $20.21, Feb 11 - Feb 21 $2.19, Feb 11 2:17 am $26.89, Jan 16 - Mar 10 $20.21, Feb 11 - Feb 21 $1.98, Feb 16 10:39 am $26.89, Jan 16 - Mar 10 $20.21, Feb 11 - Feb 21 $1.70, Feb 21 11:24 pm $26.89, Jan 16 - Mar 10 $20.19, Feb 27 8:38 am $6.81, Feb 27 8:38 am $26.89, Jan 16 - Mar 10 $20.14, Mar 10 5:12 am $7.64, Mar 10 5:12 am $32.00, Mar 22 12:45 am $20.07, Mar 22 12:45 am $7.25, Mar 22 12:45 am $26.89, Apr 2 - Apr 8 $19.99, Apr 2 1:07 pm $7.14, Apr 2 1:07 pm $26.89, Apr 2 - Apr 8 $19.96, Apr 8 8:20 am $7.06, Apr 8 8:20 am $28.08, Apr 20 4:26 am $19.90, Apr 20 4:26 am $7.04, Apr 20 4:26 am
93,080 1,169,348
781,250
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Price Details
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$28.08 2 days ago
Highest
$32.00 Mar 22, '16
Lowest
$24.83 Nov 19, '13
Average
$28.91 (30d avg) $27.54 (90d avg) $27.68 (180d avg) $27.25 (365d avg) $27.21 (Lifetime average)
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Sep 14, 2013
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$19.90 2 days ago
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$25.06 Dec 22, '14
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$18.68 Jun 17, '14
Average
$20.01 (30d avg) $20.15 (90d avg) $20.33 (180d avg) $20.78 (365d avg) $20.69 (Lifetime average)
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Sep 14, 2013
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$7.15 (30d avg) $5.24 (90d avg) $6.50 (180d avg) $6.58 (365d avg) $6.87 (Lifetime average)
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Sep 14, 2013
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30 day average: 554,268 90 day average: 706,513
Product Description
No matter what we do, however kind or generous our deeds may seem, a hidden motive of selfishness lurks--or so science has claimed for years. This book, whose publication promises to be a major scientific event, tells us differently. In philosopher Elliott Sober and biologist David Sloan Wilson demonstrate once and for all that unselfish behavior is in fact an important feature of both biological and human nature. Their book provides a panoramic view of altruism throughout the animal kingdom--from self-sacrificing parasites to insects that subsume themselves in the superorganism of a colony to the human capacity for selflessness--even as it explains the evolutionary sense of such behavior.Explaining how altruistic behavior can evolve by natural selection, this book finally gives credence to the idea of group selection that was originally proposed by Darwin but denounced as heretical in the 1960s. With their account of this controversy, Sober and Wilson offer a detailed case study of scientific change as well as an indisputable argument for group selection as a legitimate theory in evolutionary biology. also takes a novel evolutionary approach in explaining the ultimate psychological motives behind unselfish human behavior. Developing a theory of the proximate mechanisms that most likely evolved to motivate adaptive helping behavior, Sober and Wilson show how people and perhaps other species evolved the capacity to care for others as a goal in itself.A truly interdisciplinary work that blends biology, philosophy, psychology, and anthropology, this book will permanently change not just our view of selfless behavior but also our understanding of many issues in evolutionary biology and the social sciences.
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