Error message

  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).
  • Notice: Trying to get property of non-object in highwire_system_message() (line 2433 of /opt/sites/ms-pnas-frontmatter/drupal-highwire/modules/highwire/highwire.module).

PNAS Podcasts

Vieland

Veronica Vieland discusses a common disconnect between scientists and statisticians in evaluating scientific evidence.
November 17, 2014 | Running Time: 4:29

Transcript | Listen to MP3

Robin Ali

Robin Ali describes efforts to transplant healthy rod and cone cells into afflicted retinas.
November 3, 2014 | Running Time: 6:08

Transcript | Listen to MP3

James Collins

Hesham Sadek explains the regenerative capability of newborn mouse hearts.
October 20, 2014 | Running Time: 4:40

Transcript | Listen to MP3

Ambassador Deborah Birx

Ambassador Deborah Birx discusses international efforts in the fight against HIV/AIDS. Image courtesy of Wikimedia Commons/C. Goldsmith.
October 6, 2014 | Running Time: 5:59

Transcript | Listen to MP3

Francesco Pennacchio

Elaine Mardis discusses how next generation sequencing technology is helping the Pan-Cancer Initiative gain a molecular understanding of cancer. Image © iStockphoto/photo 168.
September 15, 2014 | Running Time: 6:21

Transcript | Listen to MP3

David Schaffer

David Schaffer describes how to culture human stem cells in a fully-defined, scalable 3D medium. Image courtesy of Yuguo Lei.
September 2, 2014 | Running Time: 6:00

Transcript | Listen to MP3

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Front Matter in PNAS

PNAS is known for its wealth of interesting, vibrant research articles and plays a key role in the development of science and scientific discussion. However, not everyone has the time or inclination to dive deep into the research papers we publish. As a result, we have launched an expanded front section of PNAS aimed at a more general level of discussion, tackling the stories of science in interesting ways.