James Randi Educational Foundation
National Center for Science Education, Inc.
Center for Naturalism

Secular Coalition for America
Evolution - Skeptical Search Engine
Skeptical Software Tools
Science Daily
Bad Psychics
Autism Science Foundation
The Reason Project - “charitable foundation devoted to spreading scientific knowledge and secular values in society.”
Institute for Science and Medicine
The Thinking Atheist
Foundation Beyond Belief
Vision of Humanity
10:23 Campaign - "Homeopathy: There's nothing in it"
atheistvolunteers.org/
Debunkatron
Atheism Resource
trustortrash.org/

And here's another awesome directory of science and skeptical sites with only some overlap: RESURCH+ORG


Science, Skeptical, and/or Atheist Blogs:
NY Atheist & Skeptic Examiner (Michael Rosch's blog)
Skepacabra (Michael Rosch's other blog)
The Gotham Skeptic (official blog of the NYC Skeptics)
Neurologica (Steve Novella's blog)
Skepchick
Pharyngula (PZ Myers' blog)
Respectful Insolence (Orac's blog)
Denialism Blog (Mark Hoofnagle's blog)
White Coat Underground (PalMD's blog)
Bad Astronomy (Phil Plait's blog)
Science-Based Medicine
Friendly Atheist (Hermant Mehta)
The Intersection (Chris Mooney and Sheril Kirshenbaum's blog)
The Rogues Gallery (Official blog of the Skeptics Guide to the Universe)
Greta Christina's blog
The Amateur Scientist (Brian Thompson's blog)
The Bird's Brain (Kirsten Stanford's blog)
Bad Science (Ben Goldacre's blog)
Skepticblog (Skeptologists' blog)
Some Canadian Skeptic
Teen Skepchick
The Skepbitch (Karen Stollznow's blog)
ERV (Abbie Smith's blog)

James Randi Educational Foundation Swift Blog
Dangerous Talk Blog
Letters from a broad
Autism News Beat
Cocktail Party Physics
The Edger: Making The New Atheism Sexy
Skeptico
Enemy Combatant Trailmix Appreciation Club: Godless, not Gutless
Better Health (Val Jones' blog)
Skeptigirl
Science-Based Parenting
Age of Ignorance
Unreasonable Faith (Daniel Florien's blog)
Rationally Speaking (Massimo Pigliucci's blog)
Autism Vox
Richard Wiseman's blog
Greg Laden's Blog
Countering Age of Autism
Personal Blog of Sachiko McLean


Science, Skeptical, and Atheist Podcasts:
Skeptics Guide To The Universe & Skeptics Guide 5x5
Skepticality
Skeptoid
QuackCast
The Conspiracy Skeptic
The Debate Hour
Geologic Podcast
Point of Inquiry
Skepchick Podcast
The Skeptic Zone
Irreligiosophy


Wiki
Big Bang | Abiogenesis | Evolution | Transitional fossil | List of transitional fossils
Human Evolution | RNA | DNA | Chromosome 2 (human)


Charity and volunteer work:
Skeptics and Humanists Aid and Relief Efforts (SHARE)
Crowd Rise

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