Atomic Spectra Database at the National Institute of Standards and Technology (NIST)
Atomic Weights and Isotopic Compositions at NIST
The Biology Project at the University of Arizona
Computational Molecular Biology At the National Institute of Health (NIH)
Colour & Vision Research Laboratory
Human Physiology Lecture Notes by Gary Ritchison at Eastern Kentucky University
Interactive physics textbook at the University of Pennsylvania
Introductory Physics Notes at the University of Winnipeg
Magnetic Resonance - Technology Information Portal
Particle Data Table from the Particle Data Group at Los Alamos National Laboratory
Periodic Table of the Elements at Los Alamos National Laboratory
Decay Data home page at Los Alamos National Laboratory
Powers of Ten at the National High Magnetic Field Laboratory at Florida State University
NIST pages on constants, units and uncertainty
The Heart: An Online Exploration
The Virtual Laboratory at the University of Oregon
University of Michigan's Table of Biomaterials Properties
and
The Google Advanced Search Engine
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