Articles

Research, Development, and the Improvement of Education

See allHide authors and affiliations

Science  01 Nov 1968:
Vol. 162, Issue 3853, pp. 541-545
DOI: 10.1126/science.162.3853.541

Article Information

vol. 162 no. 3853 541-545

PubMed: 
Print ISSN: 
Online ISSN: 

Author Information

Altmetric

Article usage

Article usage: April 2007 to October 2020

AbstractFullPdf
Apr 2007001
May 2007001
Aug 2007001
Oct 2007002
Jan 2008001
Apr 2008001
Jun 2008001
Feb 2009001
Mar 2009001
Apr 2009001
Jul 2009001
Feb 2010001
Aug 2010001
Feb 2011001
Jan 2012003
May 2012001
Oct 2012001
May 2013002
Jun 2013001
Aug 2013200
Sep 2013400
Oct 2013400
Nov 2013401
Dec 2013500
Jan 2014200
Feb 2014300
Apr 2014900
May 2014300
Jun 2014001
Jul 2014200
Sep 2014400
Oct 2014300
Nov 2014200
Dec 2014102
Mar 2015302
Apr 2015201
Jun 2015102
Jul 2015201
Aug 2015001
Sep 2015101
Oct 2015100
Nov 2015701
Dec 2015500
Mar 2016001
Jul 2016001
Aug 2016001
Nov 2016001
May 2017002
Aug 2017001
Dec 2017001
Jan 2018001
Mar 2018001
Apr 2018004
May 2018003
Jun 2018001
Jul 20180011
Aug 20180011
Sep 20181014
Oct 20181015
Nov 20180018
Dec 2018007
Jan 2019008
Feb 2019006
Mar 20190010
Apr 2019007
May 2019007
Jun 20190010
Jul 2019005
Aug 2019007
Sep 20190012
Oct 2019008
Nov 20190015
Dec 2019009
Jan 20200014
Feb 2020005
Mar 20200020
Apr 20200012
May 20200012
Jun 2020008
Jul 20200018
Aug 20200011
Sep 2020005
Oct 2020006

Stay Connected to Science