You can find information & resources of science, biotechnology, chemistry, ecology, technology, science resources, mechanical engineering, earth sciences, astrophysics, nuclear & molecular at PortalScience.com |
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Calculators and UltraConverter
offers interactive converters for distance, area, volume, mass, time, velocity, force, pressure, energy, power, density, flow, luminance, illuminance, temperature, and angles.
http://www.1728.com/
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curiouser.co.uk
offers paradoxical designs, puzzles, poems, and ideas.
http://www.curiouser.co.uk/
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Cut the Knot
interactive mathematics miscellany and puzzles.
http://www.cut-the-knot.org/
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Free Puzzles
offering geometry, logic, math, weight and other categories.
http://www.freepuzzles.com/
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Math Cats
creative, open-ended math explorations for children. Also includes cat and dog stories.
http://www.mathcats.com/
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Mathpuzzle.com
celebrates math puzzles and mathematical recreations.
http://www.mathpuzzle.com/
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Mathwizz
problems and help for K-12, loan and mortgage calculators, and fun links.
http://www.mathwizz.com/
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QuickMath
free automated service which provides solutions to all sorts of common mathematical problems within a couple of seconds.
http://www.quickmath.com/
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The Problem Site
provides math problems, brainteasers, and riddles online. These puzzles aid in developing problem solving and lateral thinking skills.
http://www.theproblemsite.com/
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thrackle.org
dedicated to John Conway's thrackle problem.
http://www.thrackle.org/
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